A batch of coal was shipped from the coal factory, and (3/10) of the total amount was used for the first time. (3/8) of the total amount is used up for the second time, and there are 65 tons left. How many tons are there in total in this batch of coal?
煤厂运来一批煤，第一次用去总数的(3/10)．第二次用去总数的(3/8)，还剩下65吨，这批煤一共有多少吨？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">1 - (3/10) - (3/8)</gadget>
<output>13/40 = around 0.325</output>

<gadget id="calculator">65 / (13/40)</gadget>
<output>200</output>

<result>200</result>