There are 4 parts A of 5 tons, 6 parts B of 4 tons, 11 parts C of 3 tons, and 7 parts D of 1 ton. If all the parts are to be transported away at one time, at least how many vehicles with a load of 6 tons are needed.
现有5吨的A零件4个，4吨的B零件6个，3吨的C零件11个，1吨的D零件7个．如果要将所有零件一次运走，至少需要载重为6吨的汽车多少辆．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">3 * 11</gadget>
<output>33</output>

<gadget id="calculator">20 + 24 + 33 + 7</gadget>
<output>84</output>

<gadget id="calculator">84 / 6</gadget>
<output>14</output>

<result>14</result>