For a pile of coal, (7/15) of the total amount is removed for the first time, and 40% of the total amount is removed for the second time. It is known that 10 tons more coal was transported in the first time than in the second time. How many tons are there in total in this pile of coal?
一堆煤，第一次运走总数的(7/15)，第二次又运走总数的40%．已知第一次比第二次多运走10吨，这堆煤共有多少吨？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(7/15) - (2/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">10 / (1/15)</gadget>
<output>150</output>

<result>150</result>