On a construction site, a batch of cement is transported by two cars, the size of which is 3.2 tons, which is 1/5 less than that of a large car. % are transported by car. If the car is required to be transported 5 times, how many cars must be used to complete the task?
某建筑工地，用大小两辆汽车运一批水泥，小汽车每辆的载重量是3.2吨，比大汽车每辆的载重量少(1/5)，先由大汽车运8次，余下60%由小汽车来运．如果要求小汽车5次运完，必须用几辆小汽车来运才能完成任务？
<gadget id="calculator">1 / 5</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">3.2 / (4/5)</gadget>
<output>4</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 / (2/5)</gadget>
<output>20</output>

<gadget id="calculator">4 * 20</gadget>
<output>80</output>

<gadget id="calculator">(3/5) / 5 / 3.2</gadget>
<output>0.0375</output>

<gadget id="calculator">80 * 0.0375</gadget>
<output>3</output>

<result>3</result>