pile of sand weighs (5/6) tons, (2/5) is used up, how many tons are used, and the total ((())/(())) remains.
一堆沙土重(5/6)吨，用去了(2/5)，用去了多少吨，还剩总数的((())/(()))．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(5/6) * (2/5)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>