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请教prep上的两道数学题
132.
If the drama club and music club are combined, what percent of the combined membership will be male?
(1)Of the 16 members of the drama club, 15 are male.
(2)Of the 20 members of the music club, 10 are male.
答案E，让我怀疑我的智商，为什么不是(15+10)/(16+20)？
2.
If k is a positive integer, is k the square of an integer?
(1) k is divisible by 4.
(2) k is divisible by exactly four different prime numbers.
答案E，继续怀疑我的智商。。。我选B，如果k恰好被4个不同的质数整除，那么说明它不会有两个相同的因子，就不可能是某个数的平方啊，请问哪里想错了？ |
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