The greatest common divisor of two numbers is 4, the least common multiple is 60, and one of them is 12, what is the other number?
两个数的最大公约数是4，最小公倍数是60，其中一个数是12，那么另一个数是多少．
<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>