A pile of coal can be burned for 18 days by burning an average of 10 tons per day. If it burns an average of 12 tons per day, how many days can it be burned?
一堆煤平均每天烧10吨可以烧18天，如果平均每天烧12吨，可以烧多少天？
<gadget id="calculator">10 / 12</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">18 * (5/6)</gadget>
<output>15</output>

<result>15</result>