The school cafeteria bought a pile of coal. It was originally planned to burn 1.25 tons per day, which can be burned for 16 days. After carrying out the saving activities, the cafeteria can save 0.25 tons per day. How many days can this pile of coal be burned?
学校食堂购买一堆煤，原计划每天烧1.25吨，可以烧16天，开展节约活动后，食堂每天可节约0.25吨，照这样计算这堆煤可以烧多少天？
<gadget id="calculator">1.25 * 16</gadget>
<output>20</output>

<gadget id="calculator">1.25 - 0.25</gadget>
<output>1</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<result>20</result>