What is the greatest common factor of the least common multiple of 15 and 25?
15和25的最小公倍数是最大公因数的多少倍．
<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>