Convenience stores used 3 tons of coal last month, 25% less than planned. How many tons of coal are planned to be used?
便民商店上个月用煤3吨，比计划节省了25%，计划用煤多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / (3/4)</gadget>
<output>4</output>

<result>4</result>