The paper mill transported 270 tons of coal and planned to burn it for 30 days. The actual coal consumption is 7.5 tons per day, how many tons have been saved compared to the plan?
造纸厂运进煤270吨，计划烧30天．实际每天用煤7.5吨，比计划节省了多少吨？
<gadget id="calculator">270 / 30</gadget>
<output>9</output>

<gadget id="calculator">9 - 7.5</gadget>
<output>1.5</output>

<result>1.5</result>