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?
The total cost of five boxes of pizza is $7 x 5 =$
<gadget id="calculator">7*5</gadget>
<output>35</output>
35.
He gave $35 x 1/7 = $
<gadget id="calculator">35*1/7</gadget>
<output>5</output>
5 tip to the delivery man.
He spent a total of $35 + $5 = $
<gadget id="calculator">35+5</gadget>
<output>40</output>
40 for the pizza and the tip.
The change that he received is $100 - $40 = $
<gadget id="calculator">100-40</gadget>
<output>60</output>
60.

<result>60</result>