Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Yis 25 percent ryegrass and 75 percent fescue. If a mixture of X and V contains 30 percent ryegrass, what percent of the weight of the mixture is X?
(A) 10%
(B) 33 1/3%
(C) 40%
(D) 50%
(E) 66 1/3%
答案：B
If nis a positive integer, then n(n +l)(n +2) is
(A) even only when n is even
(B) even only when n is odd
(C) odd whenever n is odd
(D) divisible by 3 only when n is odd
(E) divisible by 4 whenever n is even
答案：E
答案：D
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