There is an explorer who plans to cross the desert on foot in 6 days. If the porters and explorers can only carry at most one person's food and water for 4 days, then how many workers should the explorer hire at least?
有一位探险家，计划用6天的时间徒步横穿沙漠，如果搬运工人和探险家每人最多只能携带1个人4天所需的食物和水，那么这个探险家至少要雇用多少名工人．
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