human
In a 90-minute soccer game, Mark played 20 minutes, then rested after. He then played for another 35 minutes. How long was he on the sideline?
assistant
How many minutes did Mark play? ** Mark played for a total of 20 + 35 = <<20+35=55>>55 minutes.
How many minutes was Mark on the sideline? ** So, he was on the sideline for 90 - 55 = <<90-55=35>>35 minutes.
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