A batch of coal is brought in from the boiler room. If it burns 1.2 tons per day, it can burn for 20 days. Now burn 0.2 tons less every day, how many days can it burn?
锅炉房运来一批煤，如果每天烧1.2吨，可以烧20天．现在每天少烧0.2吨，可以烧多少天？
<gadget id="calculator">1.2 - 0.2</gadget>
<output>1</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

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

<result>24</result>