Seed mixture X is 40 percent ryegrass and
问题:
Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of this mixture is X ?()
A.A
B.B
C.C
D.D
E.E