Mom buys milk with 50 yuan. This kind of milk is 1.75 yuan per box. Mom bought 10 boxes. How much should I get back?
妈妈拿50元买牛奶，这种牛奶每盒1.75元，妈妈买了10盒，应找回多少元？
<gadget id="calculator">1.75 * 10</gadget>
<output>17.5</output>

<gadget id="calculator">50 - 17.5</gadget>
<output>32.5</output>

<result>32.5</result>