How much is it to write 71+49=120, 120/40=3, 90-50=40 into a comprehensive formula.
把71+49=120，120/40=3，90-50=40写成一道综合算式多少．
<gadget id="calculator">71 + 49</gadget>
<output>120</output>

<gadget id="calculator">90 - 50</gadget>
<output>40</output>

<gadget id="calculator">120 / 40</gadget>
<output>3</output>

<result>3</result>