batch of grain is transported from the warehouse, (1/4) ton is transported for the first time, (2/5) ton is transported for the second time, (3/8) ton is transported for the third time, and there are still (3) tons left at this time /10) tons, how many times the remaining amount was transported away? (expressed in fractions)
仓库运走一批粮食，第一次运走(1/4)吨，第二次运走(2/5)吨，第三次运走(3/8)吨，这时还剩下(3/10)吨，运走的是余下的多少倍？(用分数表示)
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/4) + (2/5) + (3/8)</gadget>
<output>41/40 = around 1.025</output>

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

<gadget id="calculator">(41/40) / (3/10)</gadget>
<output>41/12 = around 3.416667</output>

<result>41/12 = around 3.416667</result>