Subtract 10 from the numerator of (20/32), how much should be subtracted from the denominator to keep the fraction constant
把(20/32)的分子减去10，要使分数大小不变，分母应该减去多少
<gadget id="calculator">20 - 10</gadget>
<output>10</output>

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

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<result>16</result>