A pile of coal is planned to burn 1.5 tons per day, which can be burned for 24 days. After improving the stove, an average of 0.3 tons of coal is saved every day. How many days can this pile of coal burn now?
一堆煤，计划每天烧1.5吨，可以烧24天．改进炉灶后，平均每天节约煤0.3吨．这堆煤现在可以烧多少天？
<gadget id="calculator">1.5 - 0.3</gadget>
<output>1.2</output>

<gadget id="calculator">24 / 1.2</gadget>
<output>20</output>

<gadget id="calculator">1.5 * 20</gadget>
<output>30</output>

<result>30</result>