84 plus 40% of the number equals 120.
84加上多少的40%等于120．
<gadget id="calculator">120 - 84</gadget>
<output>36</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">36 / (2/5)</gadget>
<output>90</output>

<result>90</result>