A pile of coal weighs 120 tons. 20% of the total weight is removed on the first day, and 25% of the total weight is removed on the second day. How many tons are left?
一堆煤重120吨，第一天运走了总重量的20%，第二天运走总重量的25%，还剩下多少吨？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">120 * (11/20)</gadget>
<output>66</output>

<result>66</result>