The product of two factors is 210, if both factors are reduced by 10 times, what is the product.
两个因数的积是210，如果两个因数都缩小10倍，则积是多少．
<gadget id="calculator">210 / 10 / 10</gadget>
<output>21/10 = around 2.1</output>

<result>21/10 = around 2.1</result>