When two numbers are multiplied, one factor is reduced by 10 times and the other factor is expanded by 20 times, what is the original product of them?
两个数相乘，一个因数缩小10倍，另一个因数扩大20倍，它们的积是原来的多少倍．
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<result>2</result>