Mingming's crayon used to be 8 centimeters long, but 5 millimeters are used up, how many millimeters are left?
明明的蜡笔原来长8厘米，用去了5毫米，还剩多少毫米．
<gadget id="calculator">8 * 10</gadget>
<output>80</output>

<gadget id="calculator">80 - 5</gadget>
<output>75</output>

<result>75</result>