Seed mixture X is 40% ryegrass and 60% bluegrass by weight; seed mixture Y is 24% ryegrass and 75% fescue. If a mixture of X and Y contains 36% ryegrass, what percent of the weight of the mixture is from mixture X?	Choose the correct choice from the following answers:
A) 25 % B) 40 % C) 60 % D) 75 % E) 90 %

Rationale: 36 % is 12 % - points above 25 % and 4 % - points below 40 % . thus the ratio of mixture y to mixture x is 1 : 3 . the percent of mixture x is 3 / 4 = 75 % . the answer is d .
Answer: D