After adding the same number to the numerator and denominator of (1/8), it will be (3/4). What is the added number?
给(1/8)的分子和分母加上同样的一个数后是(3/4)，加上的数是多少？
<gadget id="calculator">24 - 4</gadget>
<output>20</output>

<result>20</result>