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Data interpretation

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by MBA.Aspirant » Fri Nov 18, 2011 8:04 pm
Please refer to the attached graph

Households with efficient appliances and good maintenance can reduce water consumption by about 35%. If approximately half of the residential consumption in town W in 2010 was by households with these characteristics, how many billions of gallons of water were saved that year?

A) 5
B) 14
C) 40
D) 52
E) 65
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by pemdas » Fri Nov 18, 2011 10:35 pm
You posted Kaplan's GRE question??? ':roll:'

q.#49 Kaplan's premier for GRE revised, answer is B=14

p.s. why to post GRE related stuff here when there is more dedicated web-site at https://www.urch.com/forums/gre/
MBA.Aspirant wrote:Please refer to the attached graph

Households with efficient appliances and good maintenance can reduce water consumption by about 35%. If approximately half of the residential consumption in town W in 2010 was by households with these characteristics, how many billions of gallons of water were saved that year?

A) 5
B) 14
C) 40
D) 52
E) 65
:roll: :roll: :roll:
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by MBA.Aspirant » Fri Nov 18, 2011 10:53 pm
Because I already posted it there Pemdas, and didn't get a satisfying answer :). So I posted it here for experts and members to elucidate in a better way.
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by pemdas » Fri Nov 18, 2011 11:03 pm
have you looked into Kaplan's explanation, it's easy q. really (without bugging on any one)
I remember giving this a good shot at first try, as I also used this book, and I agree that Data interpretation can be nasty q. in GRE quant. As long as you get used to them they are easy.
below is Kaplan's take on this q.:
"the residential consumption (in billions) in 2010 was approximately 52. Take half of that amount,26, to represent the amount of water used by households with efficient appliances and plumbing. Let W represent the amount of water these households would have used otherwise.

Set up a percent equation to solve for W. Remember, the saving were 35%, so subtract 35 from 100 to find the amount that would have been used.

26=(100%-35%)*W
26=65%*W
26=0.65*W
26/0.65=40=W

The savings in billions of gallons were 40-26=14."
MBA.Aspirant wrote:Because I already posted it there Pemdas, and didn't get a satisfying answer :). So I posted it here for experts and members to elucidate in a better way.
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