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how many left?

fruitbasket 2010-01-12 16:24:18 ( reads)

A boy has 45 watermelons in the desert. He needs to get them across to
the Oasis fair, 15 miles away. He can only carry 15 watermelons at a
time, and he eats one watermelon every mile he walks, including walking
back to where he started from. He can also leave watermelons at any
mile he has walked, but no fractions of a mile. How many watermelons
can he possibly take to the fair? How did you arrive at your
conclusion?

跟帖(11)

Jinjing

2010-01-12 19:36:51

回复：how many left?

Commentate

2010-01-13 11:55:09

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jinjing

2010-01-13 18:23:15

回复：回复：回复：how many left?

commentate

2010-01-12 19:45:41

回复：how many left?

Jinjing

2010-01-12 20:06:28

回复：回复：how many left?

fruitbasket

2010-01-13 05:32:27

回复：how many left?

康MM

2010-01-13 08:19:10

回复：回复：how many left?

fruitbasket

2010-01-13 12:45:10

回复：回复：回复：how many left?

康MM

2010-01-13 17:02:17

write out how you get 8, and that would be a proof

Jinjing

2010-01-13 17:55:32

回复：write out how you get 8, and that would be a proof

Commentate

2010-01-13 08:29:05

回复：回复：how many left?