A stationery box is 4.5 yuan, a diary is 3.7 yuan, and Wang Hong's belt is 10 yuan each. How much money is left?
一个文具盒4.5元，一本日记本3.7元，王红带10元钱各买了一样，还剩多少钱？
<gadget id="calculator">4.5 + 3.7</gadget>
<output>8.2</output>

<gadget id="calculator">10 - 8.2</gadget>
<output>1.8</output>

<result>1.8</result>