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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2508
Given Kudos: 1053
GPA: 3.39
The rainfall in City M during May of last year was 3 times the average
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26 Jun 2022, 22:52
26 Jun 2022, 22:52
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The rainfall in City M during May of last year was 3 times the average (arithmetic mean) monthly rainfall for the other 11 months of last year. If the average monthly rainfall for last year was 3.5 inches, what was the rainfall, in inches, in City M during May?
A. 1.5
B. 2
C. 4.5
D. 6
E. 9
A. 1.5
B. 2
C. 4.5
D. 6
E. 9
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Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: The rainfall in City M during May of last year was 3 times the average
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27 Jun 2022, 07:21
27 Jun 2022, 07:21
1
GeminiHeat wrote:
The rainfall in City M during May of last year was 3 times the average (arithmetic mean) monthly rainfall for the other 11 months of last year. If the average monthly rainfall for last year was 3.5 inches, what was the rainfall, in inches, in City M during May?
A. 1.5
B. 2
C. 4.5
D. 6
E. 9
A. 1.5
B. 2
C. 4.5
D. 6
E. 9
Let k = the rainfall (in inches) for EACH MONTH last year excluding May
This means 3k = the rainfall (in inches) in May last year
So, the TOTAL rainfall = 11k + 3k = 14k
If the average monthly rainfall for last year was 3.5 inches, we can write: 14k/12 = 3.5
Multiply both sides of the equation by 12 to get: 14k = 42
Divide both sides by 14 to get: k = 42/14 = 3
This means each month, excluding May, received 3 inches of rainfall.
So the rainfall in May = 3 x 3 = 9 inches.
Answer: E
Re: The rainfall in City M during May of last year was 3 times the average
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22 Jun 2024, 08:28
22 Jun 2024, 08:28
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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