Subtract 8 from the denominator of (10/16), how much should be subtracted from the numerator to keep the size of the fraction unchanged.
把(10/16)的分母减去8，要使分数的大小不变，分子应减去多少．
<gadget id="calculator">16 - 8</gadget>
<output>8</output>

<gadget id="calculator">16 / 8</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<result>5</result>