The younger brother's height is 80 centimeters, how much longer he is exactly 1 meter.
弟弟的身高是80厘米，他再长多少正好是1米．
<gadget id="calculator">1 * 100</gadget>
<output>100</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<result>2</result>