The original coal of the power plant was 7500 tons, but (3/5) was used up. How many tons of coal was used?
发电厂原有煤7500吨，用去了(3/5)，用去了多少吨煤？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7_500 * (3/5)</gadget>
<output>4_500</output>

<result>4_500</result>