A pile of coal was removed for the first time (2/5), and 48 tons were removed for the second time, leaving (1/4). How many tons was there in this pile of coal?
一堆煤，第一次运走(2/5)，第二次运走48吨，还剩(1/4)，这堆煤原来有多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">48 / (7/20)</gadget>
<output>960/7 = around 137.142857</output>

<result>960/7 = around 137.142857</result>