The task is to generate the correct answer for a given math problem.

Input: Consider Input: 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 ?

Output: 100 %


Input: Consider Input: Problem: the ratio of the radius of two circles is 1 : 3 , and then the ratio of their areas is ?

Output: 1 : 9


Input: Consider Input: Problem: find the simple interest on $ 10000 at 4 % per annum for 12 months ?


Output: $ 400