A pile of coal consumes 120 tons, which is 1/3 more than the rest. How many tons does this pile of coal have?
一堆煤用去120吨，比余下的多(1/3)，这堆煤原有多少吨．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

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

<gadget id="calculator">90 + 120</gadget>
<output>210</output>

<result>210</result>