After the denominator of (9/16) is increased by 32, to keep the size of the fraction unchanged, how much should be added to the numerator.
(9/16)的分母增加32后，要使分数的大小不变，分子就要加上多少．
<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<gadget id="calculator">27 - 9</gadget>
<output>18</output>

<result>18</result>