Five identical vehicles can transport 22.5 tons of grain at one time. According to this calculation, how many additional vehicles are needed to transport 36 tons of grain at one time?
用5辆同样汽车运粮食一次能运22.5吨，照这样计算，要把36吨粮食一次运完，需要增加多少辆这样的汽车？
<gadget id="calculator">36 * 5</gadget>
<output>180</output>

<gadget id="calculator">180 / 22.5</gadget>
<output>8</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>