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  3. A desert outpost has a water supply that is sufficient to last 21 days for 15 people. At the same average rate of water consumpt

A desert outpost has a water supply that is sufficient to last 21 days for 15 people. At the same average rate of water consumpt

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问题 A desert outpost has a water supply that is sufficient to last 21 days for 15 people. At the same average rate of water consumption per person, how many days would the water supply last for 9 people?
选项 A、28
B、32.5
C、35
D、37.5
E、42
答案C
解析 The water supply is enough for 15 people to survive 21 days. Assuming the same average rate of water consumption per person, 1 person would have enough water to last for(15)(21)= 315 days. Therefore, 9 people would have enough water for 1/9 of the 315 days, or 35 days. The correct answer is Choice C.
    Another approach to solving this problem is to recognize that the water supply would last 15/9 as many days for 9 people as it would for 15 people. Therefore, since the water supply would last 21 days for 15 people, it would last (15/9)(21), or 35 days for 9 people. The correct answer is Choice C.
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