If a number is divided by 25 and then multiplied by 4, the product is 100. What is the number?
一个数除以25后，再乘4，其积为100，这个数是多少．
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<result>625</result>