X: 40% ryegrass and Y: 25% ryegrass, since the mixture of X and Y has 30% ryegrass we know that it has more Y than X, but let's work out the exact breakdown:

Let x = the % of Y and 1-x = the % of X

25x + 40(1-x) = 30

25x + 40 - 40x = 30

10 = 15x

2/3 = x

% of X is 1-x, which is 1/3 so the answer is B. 33.33%

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