16*50=800, one of the factors 16 becomes 8, how much should the other factor be changed to keep the product unchanged.
16*50=800，其中一个因数16变成8，要使积不变，另一个因数要变成多少．
<gadget id="calculator">16 / 8</gadget>
<output>2</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<result>100</result>