Three vehicles, A, B, and C, transport a batch of chemical fertilizers. Vehicle B transports them alone in 10 days. Now, after truck A has been transported alone for several days, there is still (5/8) of the total amount left. Vehicles B and C are combined to transport 4 One day, just after the transportation, the two vehicles A and B transported a total of this batch of fertilizers.
甲、乙、丙三辆车运一批化肥，乙车独运10天运完，现在甲车单独运了若干天后，还剩下总数的(5/8)，乙丙两车又合运4天，恰好运完，甲乙两车共运了这批化肥的多少．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 4</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/8) + (2/5)</gadget>
<output>31/40 = around 0.775</output>

<result>31/40 = around 0.775</result>