How long will p litres of water last?

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Musicat: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Tue May 03, 2016 10:02 pm

by Musicat » Thu May 05, 2016 10:55 pm

In a certain village, m litres of water are required per household per month. At this rate, if there are n households in the village, how long (in months) will p litres of water last?

A. p /mn
B. mn / p
C. mp / n
D. np / m
E. npm

OA: A

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Source: Beat The GMAT — Problem Solving | Thu May 05, 2016 10:55 pm

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by [email protected] » Fri May 06, 2016 9:40 am

Hi Musicat,

This question can be solved by TESTing VALUES.

IF...
M = 2
N = 3

Then we know that 2 liters are required per household per month and that there are 3 households in the village. In this scenario, we will need 6 liters per month.

P = 12 liters means that this water will last for 2 months, so we're looking for an answer that equals 2 when we plug in the three VALUES chosen.

There's only one answer that matches..

Final Answer: A

GMAT assassins aren't born, they're made,
Rich

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