Les brought 6 pair of shorts for s dollars each and a blazer that cost three times as much as a pair of shorts. He spent a total of $139.50. How much did the blazer cost?

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the 6 pairs of shorts would cost (s being the cost of the pair of shorts)  6*s and the blazer would cost 3*s and together they were 9s, which is 139.50 so each S is 139.50/9=15.5 and the Blazer was 3*s, so 3*15.5=46.5 which is the answer!

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