To transport 29.5 tons of coal, first use a truck with a load of 4 tons for three times, and then use a truck with a load of 2.5 tons to transport the rest. How many more times will it take to finish shipping?
运送29.5吨煤，先用一辆载重4吨的汽车运3次，剩下的用一辆载重为2.5吨的货车运．还要运几次才能运完？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">29.5 - 12</gadget>
<output>17.5</output>

<gadget id="calculator">17.5 / 2.5</gadget>
<output>7</output>

<result>7</result>