A pile of coal, originally planned to burn 1.5 tons per day, can be burned for 36 days. The actual saving is 0.3 tons per day, so how many days can it be burned? (Solve with ratio)
一堆煤，原计划每天烧1.5吨，可以烧36天．实际每天节约0.3吨，这样可以烧几天？(用比例解)
<gadget id="calculator">1.5 * 36</gadget>
<output>54</output>

<gadget id="calculator">1.5 - 0.3</gadget>
<output>1.2</output>

<gadget id="calculator">54 / 1.2</gadget>
<output>45</output>

<result>45</result>