A batch of coal was shipped from the school cafeteria. It was originally planned to burn 60 kilograms per day, which can be burned for 12 days; due to the improvement of the coal-burning device, only 45 kilograms were burned per day. How many days can this batch of coal be burned?
学校食堂运来一批煤，原计划每天烧60千克，可以烧12天；由于改进了烧煤的装置，结果每天只烧了45千克，这批煤可以烧多少天？
<gadget id="calculator">12 / 45</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">60 * (4/15)</gadget>
<output>16</output>

<result>16</result>