Zhangzhuang needs to transport 150 tons of grain to the warehouse, of which 60% is transported by boat, and the rest is transported by 3 trucks. Each truck can transport 5 tons at a time. How many times will it take the truck to transport the remaining grain?
张庄要运150吨粮食到仓库，其中60%用船运，余下的用3辆卡车运，每辆卡车一次可运5吨，卡车要几次才能将余下的粮食运完？
<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">(2/5) / 3 / 5</gadget>
<output>2/75 = around 0.026667</output>

<gadget id="calculator">150 * (2/75)</gadget>
<output>4</output>

<result>4</result>