A batch of coal can be burned for 50 days according to the plan to burn 5.4 tons per day, and the actual saving is 0.4 tons per day. How many days can this batch of coal actually be burned?
一批煤，按计划每天烧5.4吨计算，可烧50天，实际每天节约0.4吨，这批煤实际可烧多少天？
<gadget id="calculator">5.4 - 0.4</gadget>
<output>5</output>

<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">5.4 * 10</gadget>
<output>54</output>

<result>54</result>