A pile of sand weighs (15/16) tons, (2/5) is used up, how many tons are used, and the total amount ((())/(())) remains.
一堆沙土重(15/16)吨，用去了(2/5)，用去了多少吨，还剩总数的((())/(()))．
<gadget id="calculator">15 / 16</gadget>
<output>15/16 = around 0.9375</output>

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

<gadget id="calculator">(15/16) * (2/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>