A batch of cement was shipped to the construction site, 20% of which was used on the first day, and 3.2 tons on the second day, leaving 7.6 tons left. How many tons of cement are shipped to the construction site?
工地运来一批水泥，第一天用去20%，第二天用去3.2吨，还剩7.6吨．工地运来水泥多少吨？
<gadget id="calculator">3.2 + 7.6</gadget>
<output>10.8</output>

<gadget id="calculator">20 / 100</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">10.8 / (4/5)</gadget>
<output>13.5</output>

<result>13.5</result>