There are 10 pens in a box, 8 yuan each. Mr. Wang spent 240 yuan to buy the pens. How many boxes of pens did you buy?
一盒有10支钢笔，每支8元，王老师买钢笔一共用了240元，买了多少盒钢笔？
<gadget id="calculator">8 * 10</gadget>
<output>80</output>

<gadget id="calculator">240 / 80</gadget>
<output>3</output>

<result>3</result>