A set of "Fairy Tales" has 20 volumes, and each volume is 8 yuan. How many sets can the school buy with 3200 yuan?
一套《童话故事》有20本，每本8元．学校用3200元，可以购买多少套？
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">3_200 / 160</gadget>
<output>20</output>

<result>20</result>