Task: Question Answering
Input (English): Problem: 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 40 percent ryegrass, what percent of the weight of this mixture is x ?
Options: a. 100 %, b. 33.33 %, c. 40 %, d. 50 %, e. 66.66 %
Output (English): a