Add 12 to the numerator of (3/4), in order to keep the size of the fraction unchanged, the following statement is incorrect is how much should be added to the denominator
把(3/4)的分子加上12，要使分数大小不变，下列说法不正确的是分母应加上多少
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<result>16</result>