Solution \(X\) contains only ingredients \(a\) and \(b\) in a ratio of \(2:3.\) Solution \(Y\) contains only ingredients

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Solution \(X\) contains only ingredients \(a\) and \(b\) in a ratio of \(2:3.\) Solution \(Y\) contains only ingredients \(a\) and \(b\) in a ratio of \(1:2.\) If Solution \(Z\) is created by mixing solutions \(X\) and \(Y\) in a ratio of \(3:11\) then \(630\) ounces of Solution \(Z\) contains how many ounces of \(a?\)

A) 68
B) 73
C) 89
D) 219
E) 236

Answer: D

Source: Princeton Review