A pile of coal weighs 60 tons. If (3/4) of it is used up, how many tons of coal are left?
一堆煤重60吨，用去它的(3/4)，还剩多少吨煤？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 * (1/4)</gadget>
<output>15</output>

<result>15</result>