The construction site needs 47 tons of yellow sand, which needs to be transported 6 times by a truck with a load of 4.5 tons, and the rest should be transported by a truck with a load of 2.5 tons. How many times should it be transported?
建筑工地需要黄沙47吨，用一辆载重4.5吨的汽车运6次，余下的改用一辆载重2.5吨的汽车运，还要运多少次？
<gadget id="calculator">4.5 * 6</gadget>
<output>27</output>

<gadget id="calculator">47 - 27</gadget>
<output>20</output>

<gadget id="calculator">20 / 2.5</gadget>
<output>8</output>

<result>8</result>