There are 54 members of the People's Liberation Army who want to send 21 barrels of oil to a factory 18 kilometers away. Two people carry one barrel, and everyone takes turns to rest. Ask: How many kilometers does each person carry on average?
有54位解放军，要把21桶油送到18千米外的工厂，两人抬一桶，大家轮流休息，问：平均每人抬几千米？
<gadget id="calculator">2 / 54</gadget>
<output>1/27 = around 0.037037</output>

<gadget id="calculator">18 * 21 * (1/27)</gadget>
<output>14</output>

<result>14</result>