William and Harry played 15 rounds of tic-tac-toe. William won 5 more rounds than Harry. How many rounds did William win? Think carefully first, then make a decision:
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They played 15 rounds and William won 5 more rounds than Harry so that leaves 15 - 5 = 10 round. There are 2 players and 10 rounds so they each won 10 / 2 = 5 rounds. William won 5 more rounds than Harry and they each won 5 rounds so William won 5 + 5 = 10 rounds. So, the answer is 10.
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