When two numbers are multiplied together, the product is 20. If one factor remains unchanged and the other factor is reduced by 5 times, what is the product?
两数相乘，积是20，如果一个因数不变，另一个因数缩小5倍，积是多少．
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<result>4</result>