The total cost of five boxes of pizza is $7 x 5 =$<<7*5=35>>35.

He gave $35 x 1/7 = $<<35*1/7=5>>5 tip to the delivery man.

He spent a total of $35 + $5 = $<<35+5=40>>40 for the pizza and the tip.

The change that he received is $100 - $40 = $<<100-40=60>>60.

# Answer

60
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Allen ordered five boxes of pizza, which cost $7 each box. He then gave a tip which amounts to 1/7 of the total cost of his order. If he gave the delivery man $100, how much change did he receive?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
60
Allen ordered five boxes of pizza, which cost $7 each box. He then gave a tip which amounts to 1/7 of the total cost of his order. If he gave the delivery man $100, how much change did he receive?
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