Fill in the appropriate number in the brackets: (3/5)=((())/20).
在括号内填上适当的数：(3/5)=((())/20)．
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>