There is a ton of coal in a certain power plant, 3.5 tons are used on the first day, and 0.7 tons more than (3/8) of this ton of coal is used on the second day, and (1/3) of this ton of coal is left at this time, How many tons is this pile of coal?
某电厂有一吨煤，第一天用去了3.5吨，第二天用去的比这吨煤的(3/8)还多0.7吨，这时剩下这吨煤的(1/3)，这堆煤一共有多少吨？
<gadget id="calculator">3.5 + 0.7</gadget>
<output>4.2</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (3/8) - (1/3)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">4.2 / (7/24)</gadget>
<output>14.4</output>

<result>14.4</result>