For a pile of coal, 40% of it is used for the first time, and 1/5 of it is used for the second time, and 36 tons are shared between the two times. How many coals are there in this pile of coal?
一堆煤，第一次用去40%，第二次又用去它的(1/5)，两次共用去36吨．这堆煤共有多少煤？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/5) + (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">36 / (3/5)</gadget>
<output>60</output>

<result>60</result>