49.5 tons of goods are transported by car, 36 tons have already been transported, and the remaining 4.5 tons per car, how many cars are needed to finish?
用汽车运49.5吨货物，已经运了36吨，剩下的每车运4.5吨，还要几车才能运完？
<gadget id="calculator">49.5 - 36</gadget>
<output>13.5</output>

<gadget id="calculator">13.5 / 4.5</gadget>
<output>3</output>

<result>3</result>