50-20=30, 30/5=6, what is the combined formula?
50-20=30，30/5=6，合并成综合算式是多少．
<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>