If a number multiplied by 20 is 500, what is the number multiplied by 4?
如果一个数乘以20得500，那么这个数乘4得多少
<gadget id="calculator">500 / 20</gadget>
<output>25</output>

<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<result>100</result>