A batch of coal, originally planned to burn 2.5 tons per day, can be burned for 45 days; actually burns 1.5 tons per day, how many days will it be burned?
一批煤，原计划每天烧2.5吨，可以烧45天；实际每天烧1.5吨，多少天烧完？
<gadget id="calculator">45 / 1.5</gadget>
<output>30</output>

<gadget id="calculator">2.5 * 30</gadget>
<output>75</output>

<result>75</result>