The school bought 3 bookshelves and spent a total of 75 yuan. How many bookshelves can 400 yuan buy? What is the column
学校买3个书架，一共用了75元．400元可以买多少个书架？列式是多少
<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">400 / 25</gadget>
<output>16</output>

<result>16</result>