A pile of coal weighs 5 tons. If (3/8) is used up, how many tons are left?
一堆煤重5吨，用了(3/8)，还剩多少吨．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">5 * (5/8)</gadget>
<output>25/8 = around 3.125</output>

<result>25/8 = around 3.125</result>