Xiaoqing's mother went to the supermarket to buy vegetables, including 18.5 yuan for meat and 3.8 yuan for vegetables. Xiaoqing's mother paid 50 yuan, how much should I get back?
小青的妈妈到超市买菜，其中买肉用去18.5元，买青菜用去3.8元，小青的妈妈付给50元钱，应找回多少元钱？
<gadget id="calculator">18.5 + 3.8</gadget>
<output>22.3</output>

<gadget id="calculator">50 - 22.3</gadget>
<output>27.7</output>

<result>27.7</result>