(1/6) of a pile of coal is removed for the first time, and 21 tons are removed for the second time, leaving 14 tons. How many tons does this pile of coal have?
一堆煤第一次运走它的(1/6)，第二次运走21吨，还剩下14吨，这堆煤原有多少吨？
<gadget id="calculator">21 + 14</gadget>
<output>35</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">35 / (5/6)</gadget>
<output>42</output>

<result>42</result>