1680.

来源: 于 2011-01-24 09:07:46 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Six dogs each had 6 puppies. All the dogs and puppies each had 6 fleas. How many legs are there?

 

Dogs: 6

Puppies: 6*6 = 36

Total legs on dogs and puppies: (6+ 36)*4 = 168

 

All the dogs and puppies each has 6 fleas and each flea has 6 legs.

Total legs on fleas: (6+36)*6*6 = 1512

 

Total legs: 168+1512 = 1680.