Xiaohong's mother took 50 yuan to the vegetable market, and spent 28.7 yuan to buy meat, and 11.3 yuan to buy vegetables. How much money is left?
小红的妈妈带50元钱去菜市场，买肉用去28.7元，买青菜用去11.3元，还剩下多少元？
<gadget id="calculator">28.7 + 11.3</gadget>
<output>40</output>

<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<result>10</result>