A pile of cement has 120 tons, 20% of it is transported away for the first time, 1/4 of it is transported away for the second time, and the same amount is transported away for the third time as the second time, how many tons are left unshipped?
一堆水泥有120吨，第一次运走它的20%，第二次运走它的(1/4)，第三次运走的与第二次同样多，还剩多少吨没有运？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (1/4) - (1/4)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">120 * (3/10)</gadget>
<output>36</output>

<result>36</result>