To transport sand on the construction site, it takes 12 times to use a truck with a load of 3.5 tons. If you switch to a truck with a load capacity of 4.2 tons, how many times do you need to transport it?
工地上要运沙子，用载重是3.5吨卡车需要12次．如果改用载质量是4.2吨的卡车，需要运多少次？
<gadget id="calculator">12 / 4.2</gadget>
<output>2.857143</output>

<gadget id="calculator">3.5 * 2.857143</gadget>
<output>10.000001</output>

<result>10.000001</result>