A pile of coal has used up 25 tons, and there are 15 tons left. What fraction of the pile of coal is the remaining coal?
一堆煤，用去25吨，还剩15吨，剩下的煤占这堆煤的几分之几？
<gadget id="calculator">25 + 15</gadget>
<output>40</output>

<gadget id="calculator">15 / 40</gadget>
<output>3/8 = around 0.375</output>

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