A pile of coal is 2500 kg, 25% is used, how many kg is used?
一堆煤2500千克，用去25%，用去了多少千克？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2_500 * (1/4)</gadget>
<output>625</output>

<result>625</result>