What is the greatest common divisor of the least common multiple of 15 and 20?
15和20的最小公倍数是最大公因数的多少倍．
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>