The product of multiplying two numbers is 210. One factor remains the same and the other factor is reduced by 10 times. What is the product?
两个数相乘的积是210，一个因数不变，另一个因数缩小10倍，积是多少．
<gadget id="calculator">210 / 10</gadget>
<output>21</output>

<result>21</result>