According to 360/20=18, 240/20=12, 18-12=6, how much is a comprehensive formula listed.
根据360/20=18,240/20=12,18-12=6，列出一个综合算式多少．
<gadget id="calculator">360 / 20</gadget>
<output>18</output>

<gadget id="calculator">240 / 20</gadget>
<output>12</output>

<gadget id="calculator">18 - 12</gadget>
<output>6</output>

<result>6</result>