Carcass wrote:
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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)