They played 15 rounds and William won 5 more rounds than Harry so that leaves 15 - 5 = <<15-5=10>>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 = <<5+5=10>>10 rounds

# Answer

10
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
William and Harry played 15 rounds of tic-tac-toe.  William won 5 more rounds than Harry.  How many rounds did William win?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
William and Harry played 15 rounds of tic-tac-toe.  William won 5 more rounds than Harry.  How many rounds did William win?
train