For a batch of cement, all (3/10) was transported on the first day, and all (2/5) was transported on the second day. A total of 56 tons were transported in two days. How many tons of this batch of cement are there in total?
一批水泥，第一天运走全部的(3/10)，第二天运走全部的(2/5)，两天共运56吨，这批水泥共多少吨？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/10) + (2/5)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">56 / (7/10)</gadget>
<output>80</output>

<result>80</result>