A batch of coal was transported, the first batch of coal was transported (3/10), and the second batch of coal was transported 31t, leaving 5.4t. How many tons of this batch of coal are there in total?
运一批煤，第一次运走这批煤的(3/10)，第二次运走31t，还剩下5.4t，这批煤共多少吨？
<gadget id="calculator">31 + 5.4</gadget>
<output>36.4</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">36.4 / (7/10)</gadget>
<output>52</output>

<result>52</result>