It takes 10 minutes to wash 4 windows and he has 64 windows so that breaks down to 64/4 = 16 units

It takes 10 minutes to wash a unit of windows and he has 16 units so 10*16 = <<10*16=160>>160 minutes

# Answer

160
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
It takes David 10 minutes to wash 4 windows.  David's house has 64 windows.  How many minutes will it take David to wash all of the windows?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
160
It takes David 10 minutes to wash 4 windows.  David's house has 64 windows.  How many minutes will it take David to wash all of the windows?
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