When two factors are multiplied, one factor remains unchanged, and the other factor is divided by 5, the product is divided by how much
两个因数相乘，一个因数不变，另一个因数除以5，积就除以多少
<gadget id="calculator">10 * 20</gadget>
<output>200</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">200 / 40</gadget>
<output>5</output>

<result>5</result>