Mom bought a coat and trousers for Xiaohong for 72 yuan, and the price ratio of the coat and trousers was 5:3. How much did she spend on the trousers?
妈妈给小红买上衣和裤子共用72元，其中上衣和裤子价格的比是5：3，买裤子用了多少元．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">72 * (3/8)</gadget>
<output>27</output>

<result>27</result>