Tony has $87. He needs to buy some cheese, which costs $7 a pound and a pound of beef that costs $5 a pound. After buying the beef and his cheese, he has $61 left. How many pounds of cheese did he buy?
He spent $26 because 87 - 61 = 
<gadget id="calculator">87-61</gadget>
<output>26</output>
26.
He spend $21 on cheese because 26 -5 = 
<gadget id="calculator">26-5</gadget>
<output>21</output>
21.
He bought 3 pounds of cheese because 21 / 7 = 
<gadget id="calculator">21/7</gadget>
<output>3</output>
3.

<result>3</result>