After subtracting 20% of a number, wait for (3/4) of 120, and find this number.
一个数减去它的20%后，等120的(3/4)，求这个数．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<gadget id="calculator">1 - 0.2</gadget>
<output>0.8</output>

<gadget id="calculator">90 / 0.8</gadget>
<output>112.5</output>

<result>112.5</result>