The store sells a schoolbag for 28 yuan and a stationery box for 7 yuan. How many stationery boxes can you buy with the money for 3 schoolbags?
商店中出售书包28元一个，文具盒7元一个．买3个书包的钱，可以买几个文具盒？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">28 * (3/7)</gadget>
<output>12</output>

<result>12</result>