A car transports a batch of cement, 4.5 tons each time, 16 times. If 0.5 tons are transported each time, how many times can it be far away? (Solution by proportional method)
一辆汽车运一批水泥，每次运4.5吨，16次运完．如果每次运0.5吨，多少次可以远完？(用比例法解)
<gadget id="calculator">4.5 * 16</gadget>
<output>72</output>

<gadget id="calculator">72 / 0.5</gadget>
<output>144</output>

<result>144</result>