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GRE Quantitative Reasoning
QUESTION #8171
Question 1
A water supply at a desert outpost is sufficient to last 21 days for a group of 15 people. At the same average rate of consumption per person per day, how many days would that same water supply last for a group of only 9 people?
Correct Answer Explanation
Total water supply $=$ (people) $\times$ (days) $\times$ (rate per person per day).
Total supply $= 15 \times 21 = 315$ person-days.
For 9 people: days $= \dfrac{315}{9} = 35$ days.
Answer: 35.0 days.
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