The least common multiple of two numbers is 400, and the greatest common factor is 20. If one of the two numbers is 80, what is the other number?
两个数的最小公倍数是400，最大公因数是20，已知这两个数中的一个数是80，则另一个数是多少．
<gadget id="calculator">400 / 80</gadget>
<output>5</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<result>100</result>