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Post by Kronks on Dec 7, 2015 23:21:42 GMT
Waldemar the Elf has a job to do: he must collect all the Christmas wish lists from children who live in the Sahara Desert. Starting in Timbuktu, he is able to complete the round trip and return to Timbuktu in six days. But he is an elf, which means he is very small. An elf can only carry a maximum of four days’ worth of elf food. What is the minimum number of elves Waldemar needs to bring with him to complete the trip?
Clarifications: Waldemar can only travel with other elves. Every elf on the trip must eat a day’s worth of elf food every day. Elf food is not available to buy during the trip, but elves can give each other food that they have brought with them. No elf is allowed to leave Timbuktu twice, nor be left stranded in the desert with no food.
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Post by Deleted on Jan 17, 2016 13:48:23 GMT
just seen this
ill have a crack at it later
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Post by Deleted on Jan 17, 2016 14:35:48 GMT
himself and 3 other elves
he sets of with 2 of the 3 elves
till day two, when elf 1 gives him 2 days food so he can finish the journey on his own
elf 2 has 2 days food left, so he and elf 1 set of back to camp 1
after 2 days elf 3 sets off alone from tb2 to meet elf 1 and 2 at day 1 camp where he will have 3 days food left to get elf 1, 2 and 3 back home
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Post by Kronks on Jan 19, 2016 3:24:33 GMT
That might be right, I had a go at it a while back but I forget the answer, however I think it might be 6 but I can't remember, I will try again later, my brain is a bit frazzled at the moment.
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Post by Deleted on Jan 19, 2016 18:42:32 GMT
That might be right, I had a go at it a while back but I forget the answer, however I think it might be 6 but I can't remember, I will try again later, my brain is a bit frazzled at the moment. I think ive miss read it actually kronks
as it says
Waldemar can only travel with other elves
I think it means he must travel with other elves
so cant travel on his own after day two as I put
ill have another ponder on it too
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Post by Kronks on Jan 20, 2016 2:30:06 GMT
Yea and remember the elves have to eat too. You have to read it carefully I think, a casual read of it could be misleading. I will look at it again myself later as I have forgot what the answer was, think it could be 6 but not 100%
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Post by Kronks on Jan 20, 2016 2:34:56 GMT
See I don't think can give him all their food, they need food to get back themselves.
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Post by Deleted on Jan 20, 2016 22:43:06 GMT
Yea and remember the elves have to eat too. You have to read it carefully I think, a casual read of it could be misleading.I will look at it again myself later as I have forgot what the answer was, think it could be 6 but not 100% Waldemar can only travel with other elves.
that's plural so will need to be with a minimum of 2 all the time
at day 3 is the half way point so will be better for them that don't need to go all the way to go back
theres no need for them to go to day 4 as they may as well carry on to the end iykwim
so at day 3 to day 6 for W and 2 elves its 9 days food needed to get them to the end
they will only have 3 days of food between them left so are short 6 days food
so we need enough elves to have 6 days food spare at day 3 with enough food for all them elves to get home too
are you sure the wording is right
3 elves as I said works if W can travel on his own, and it doesn't say he cant
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Post by Kronks on Jan 21, 2016 4:40:47 GMT
Yea and remember the elves have to eat too. You have to read it carefully I think, a casual read of it could be misleading.I will look at it again myself later as I have forgot what the answer was, think it could be 6 but not 100% Waldemar can only travel with other elves.
that's plural so will need to be with a minimum of 2 all the time
at day 3 is the half way point so will be better for them that don't need to go all the way to go back
theres no need for them to go to day 4 as they may as well carry on to the end iykwim
so at day 3 to day 6 for W and 2 elves its 9 days food needed to get them to the end
they will only have 3 days of food between them left so are short 6 days food
so we need enough elves to have 6 days food spare at day 3 with enough food for all them elves to get home too
are you sure the wording is right
3 elves as I said works if W can travel on his own, and it doesn't say he cant
I think other elves means one or more. It is a bit ambiguous though. So that mean at least two elves must make the whole trip, so you need more elves to supply them food as they can't go all the way by themselves. A helper elve can only go one day and had over two units of food as he has used one and needs one to get back. So you need more than 3.
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Post by Deleted on Jan 22, 2016 9:32:52 GMT
Waldemar can only travel with other elves.
that's plural so will need to be with a minimum of 2 all the time
at day 3 is the half way point so will be better for them that don't need to go all the way to go back
theres no need for them to go to day 4 as they may as well carry on to the end iykwim
so at day 3 to day 6 for W and 2 elves its 9 days food needed to get them to the end
they will only have 3 days of food between them left so are short 6 days food
so we need enough elves to have 6 days food spare at day 3 with enough food for all them elves to get home too
are you sure the wording is right
3 elves as I said works if W can travel on his own, and it doesn't say he cant
I think other elves means one or more. It is a bit ambiguous though. So that mean at least two elves must make the whole trip, so you need more elves to supply them food as they can't go all the way by themselves. A helper elve can only go one day and had over two units of food as he has used one and needs one to get back. So you need more than 3. ok
ill work it out again with just one other elf going all the way with W but not just now
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Post by Deleted on Jan 22, 2016 14:50:06 GMT
ok @kronks ive worked it out and its W + 7 elves
this is how it goes, I shall say this only once
1,,,,, day 1 W sets of from tbt with 5 other elves and they travel together for 2 days,,,
(between them they will have set of with 24 days worth of food and by the end of day 2 will be left with 12 days of food )
2,,,,, at the start of day 3 W and 1 elf take 8 of the 12 days of food to enable them to finish there journey
( the 4 remaining elves have a days worth of food each, so head of back to tbt but only reach the end of day 3 and there food has gone)
3,,,,, also at the start of day 3 the two remaining elves set of from tbt to meet up with the returning 4 elves
(the 2 elves will have had 8 days worth of food to start, eaten 2 days between them leaving 6 days worth of food when they meet up with the 4 returning elves at the end of day 3)
4,,,, day 4 the 4 returning elves and the two late setting of elves all set of back to tbt with the 6 days worth of food where they await the return of W and the other elf in 2 days time
nobody travelled alone
all returned to tbt
all where fed each day
my answer is 7
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Post by Kronks on Jan 23, 2016 2:35:43 GMT
I will have a look at that later Skitler, my brain is a bit fried at the moment. Does 7 include Waldemar? ( I was trying work out if you could start a car using capacitors...I tried doing some maths but it fried my brain trying ).
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Post by Deleted on Jan 23, 2016 5:23:04 GMT
I will have a look at that later Skitler, my brain is a bit fried at the moment. Does 7 include Waldemar? ( I was trying work out if you could start a car using capacitors...I tried doing some maths but it fried my brain trying ). waldemar + 7 elves
they have capacitor start for motorbikes
used mainly in hot countries, as batteries boil dry
not sure about cold countries
but you only need about a 14amp battery for a motorbike
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Post by Kronks on Jan 23, 2016 23:51:40 GMT
Yea 14 amp is a fir bit though. I think some cars use 250 amps or there about, but it is a bit confusing. Think is with car is they have a lot of other electrical crap to power, windows, lights and whatever. Anyhow easy enough to jump start a small bike, indeed a the smaller ones are start, and some big ones I beleive.
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Post by Deleted on Jan 25, 2016 7:04:15 GMT
Yea 14 amp is a fir bit though. I think some cars use 250 amps or there about, but it is a bit confusing. Think is with car is they have a lot of other electrical crap to power, windows, lights and whatever. Anyhow easy enough to jump start a small bike, indeed a the smaller ones are start, and some big ones I beleive. ive only ever seen capacitor start on the dirt bikes
mainly the racing ones that do desert endure
like the paris-Dakar,
the less weight is also a advantage
but they don't have any ancilliary electrics
especially electric windows
I think you need a magneto instead of a alternator for powering the electrics
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Post by Kronks on Jan 27, 2016 21:37:45 GMT
With 1 elf
day 1: 3 foods each, could transfer 2 and return but then Waldemar would have 5 not allowed.
day 2: 2 foods each, no food can be transferred as 2 are needed to go back.
With 2 elves
day 1: 3 foods each, one elf gives a food to the other 2 meaning they have 4 and returns.
days 2: 2 elves with 3 foods each could transfer 1 and return leaving Waldemar with 4 so he could make the whole trip.
HOWEVER
He can't travel alone, so you simply double the numbers and repeat so he has an elves to travel with.
So the answer is 2 groups of 3 ie 6 Waldemar and 5 other elves.
]
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Post by Deleted on Jan 28, 2016 20:04:32 GMT
With 1 elf day 1: 3 foods each, could transfer 2 and return but then Waldemar would have 5 not allowed. day 2: 2 foods each, no food can be transferred as 2 are needed to go back. With 2 elvesday 1: 3 foods each, one elf gives a food to the other 2 meaning they have 4 and returns. days 2: 2 elves with 3 foods each could transfer 1 and return leaving Waldemar with 4 so he could make the whole trip. HOWEVERHe can't travel alone, so you simply double the numbers and repeat so he has an elves to travel with. So the answer is 2 groups of 3 ie 6 Waldemar and 5 other elves. ] I don't understand that equasion bye2
but they can have 4 foods each not 3
did that answer come from where the quiz was from
Well on day 0 they have 4 Maybe I should have said after eating on day 1? After eating they have 3. So it depends when they eat, or rather it depends on wether they need to eat on the first day, this is the problem, IF they do it is 3 otherwise 4
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Post by Kronks on Jan 30, 2016 1:10:00 GMT
With 1 elf day 1: 3 foods each, could transfer 2 and return but then Waldemar would have 5 not allowed. day 2: 2 foods each, no food can be transferred as 2 are needed to go back. With 2 elvesday 1: 3 foods each, one elf gives a food to the other 2 meaning they have 4 and returns. days 2: 2 elves with 3 foods each could transfer 1 and return leaving Waldemar with 4 so he could make the whole trip. HOWEVERHe can't travel alone, so you simply double the numbers and repeat so he has an elves to travel with. So the answer is 2 groups of 3 ie 6 Waldemar and 5 other elves. ] I don't understand that equasion bye2
but they can have 4 foods each not 3
did that answer come from where the quiz was from
I am not sure I can't rememeber but I had a vague idea the answer was 6. But looking at it again I think I might be wrong as might be my answer. I will need to check again did not seem to work first time I checked.
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Post by Deleted on Jan 30, 2016 6:17:07 GMT
I don't understand that equasion bye2
but they can have 4 foods each not 3
did that answer come from where the quiz was from
I am not sure I can't rememeber but I had a vague idea the answer was 6. But looking at it again I think I might be wrong as might be my answer. I will need to check again did not seem to work first time I checked. best try and find where it came from
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Post by Kronks on Jan 30, 2016 18:20:59 GMT
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Post by Deleted on Jan 30, 2016 19:43:10 GMT
like it says in the guardian
the quiz isn't worded properly
I took it to mean a elf cannot travel alone
which was my thinking in the first answer, even though I said 3 other elves
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