A pile of coal, originally planned to burn 4 tons per day, can be burned for 75 days. After improving the stove, the actual burning of 1.6 tons per day is reduced. How many days can this pile of coal actually be burned? (Solve with ratio)
一堆煤，原计划每天烧4吨，可以烧75天．改进炉灶后，实际每天少烧1.6吨，这堆煤实际可以烧多少天？(用比例解)
<gadget id="calculator">4 * 75</gadget>
<output>300</output>

<gadget id="calculator">4 - 1.6</gadget>
<output>2.4</output>

<gadget id="calculator">300 / 2.4</gadget>
<output>125</output>

<result>125</result>