A pile of sand weighs (15/16) tons, and (1/3) is used up, how many tons are left.
一堆沙土重(15/16)吨，用去了(1/3)，还剩多少吨．
<gadget id="calculator">15 / 16</gadget>
<output>15/16 = around 0.9375</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(15/16) * (2/3)</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>