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Households with efficient appliances and good maintenance ca : Data Interpretation Sets

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Re: Households with efficient appliances and good maintenance ca [#permalink]
Here is my understanding: let's assume we saved X. We know X represents 35% of the total, i.e., X/(X+25)=0.35. Solve it we get the answer.
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Re: Households with efficient appliances and good maintenance ca [#permalink]
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Carcass wrote:
Attachment:
graph.jpg


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

A. 5

B. 14

C. 40

D. 52

E. 65


Water consumption for 2010 = 50 billion gallon

1/2 of it is from the smart appliances = 25 billion gallon and 1/2 from inefficient appliances which cant be reduced = 25 billion gallon

now, from smart appliances we reduce consumption by 35 %

so, 25 billion =(1-0.35)T = 0.65 T ,
where T= total if these were inefficient appliances

therefore , T = 25 billion gallon / 0.65 = 38.46 billion gallon

thus , amount of water saved due to usage of smart appliance = 38.46 - 25 = 13.46

Ans : 14 option b (approx)
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Re: Households with efficient appliances and good maintenance ca [#permalink]
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This question is not right and well defined

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