A clothing company sells slacks that are either blue or gray and pleated or non-pleated. Last month, the company sold 5 times as many pairs of blue pleated slacks as gray pleated slacks, and it sold twice as many pairs of gray non-pleated slacks as blue non-pleated slacks. If it sold 333 pairs of blue slacks and 225 pairs of gray slacks, how many pairs of blue non-pleated slacks did it sell?

Let the number of blue non-pleated pairs be x. Then gray non-pleated pairs number 2x; if gray pleated pairs number y, blue pleated pairs number 5y. The totals give 5y + x = 333 and y + 2x = 225. Substituting y = 333 − x into the second equation gives 333 − x + 2x = 225, so x = 88. The company sold 88 pairs of blue non-pleated slacks, choice B.

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