The product of two factors is 15, one of which is (3/4), what is the other factor? How much is the column.
两个因数的积是15，其中一个因数是(3/4)，求另一个因数是多少？列式为多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<result>20</result>