Uncle Li's family bought a pile of coal. If they burn 15 kilograms a day, they can burn for 40 days. How many days can this pile of coal be burned if 12 kg is burned every day?
李伯伯家买了一堆煤，如果每天烧15千克，可以烧40天．如果每天烧12千克，这堆煤可以烧多少天？
<gadget id="calculator">40 / 12</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">15 * (10/3)</gadget>
<output>50</output>

<result>50</result>