There is a pile of coal, which was transported for the first time (1/5), and 30 tons were transported for the second time, and the remaining 18 tons have not been transported. How many tons is this pile of coal?
有一堆煤，第一次运了(1/5)，第二次运了30吨，还剩18吨没有运．这堆煤一共有多少吨？
<gadget id="calculator">30 + 18</gadget>
<output>48</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">48 / (4/5)</gadget>
<output>60</output>

<result>60</result>