One kid can wash three whiteboards in 20*4=<<20*4=80>>80 minutes.

One kid can wash six whiteboards in 80*(6/3)=160 minutes.

# Answer

160
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Four kids can wash three whiteboards in 20 minutes. How long would it take, in minutes, for one kid to wash six whiteboards?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
160
Four kids can wash three whiteboards in 20 minutes. How long would it take, in minutes, for one kid to wash six whiteboards?
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