Put 300/6=50; 70-50=20; 20/5=4. How much is it written in a comprehensive formula.
把300/6=50；70-50=20；20/5=4．写成综合式是多少．
<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<gadget id="calculator">70 - 50</gadget>
<output>20</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<result>4</result>