A machine factory plans to burn 5 tons of coal per day, which can be burned for 45 days. The actual saving of coal is 0.5 tons per day compared with the plan. How many days can this batch of coal actually be burned for?
某机厂计划每天烧煤5吨，可以烧45天，实际每天比计划节约用煤0.5吨，这批煤实际可以烧多少天？
<gadget id="calculator">5 * 45</gadget>
<output>225</output>

<gadget id="calculator">5 - 0.5</gadget>
<output>4.5</output>

<gadget id="calculator">225 / 4.5</gadget>
<output>50</output>

<result>50</result>