Ruth's Cafe offers two kinds of espresso: single-shot and double-shot. Yesterday afternoon, the cafe sold 65 espressos in all, 20% of which were single-shot. How many single-shot espressos did the cafe sell?
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The cafe sold 65 x 20/100 = <<65*20/100=13>>13 single-shot espressos. Answer: \boxed{13}.
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