There is a pile of coal in the cafeteria, burning 0.45 tons per day is enough to burn for 140 days, the actual burning is 150 days, how many kilograms is actually burned per day on average.
食堂有一堆煤，每天烧0.45吨够烧140天，实际烧150天，实际平均每天烧多少千克．
<gadget id="calculator">140 / 150</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">0.45 * (14/15)</gadget>
<output>0.42</output>

<result>0.42</result>