Xiaoya has 150 yuan. It costs 80 yuan to buy a book and 12 yuan to buy a pen. How much money is left?
小亚有150元钱．买书用掉80元，买笔用掉12元，还剩下多少钱？
<gadget id="calculator">150 - 80 - 12</gadget>
<output>58</output>

<result>58</result>