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? Pick one:
A) 25% B) 40% C) 60% D) 75% E) 90%
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 75%.
<result>D</result>
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?