The sum of the minuend, the subtrahend and the difference is 280, and the subtrahend is 100, so what is the difference.
被减数、减数与差的和是280，减数是100，那么差是多少．
<gadget id="calculator">280 / 2</gadget>
<output>140</output>

<gadget id="calculator">140 - 100</gadget>
<output>40</output>

<result>40</result>