batch of 300 tons of rice will be shipped to the disaster area. It took 4 cars to transport it away (2/5). How many trucks will it take to transport the remaining rice?
一批300吨的大米要运往灾区．运了4车才运走(2/5)．剩下的大米还要几车才能运完？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 / (2/5)</gadget>
<output>10</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<result>6</result>