carcass wrote:
The table above gives the gasoline costs and consumption rates for a certain car driven at 50 miles per hour, using each of two brands of gasoline. How many miles farther can the car be driven at this speed on $12 worth of brand I gasoline than on $12 worth of brand Y gasoline?
(A) 20
(B) 24
(C) 84
(D) 100
(E) 104
The table gives the cost and mileage of two brands of gasoline. Brand X is more expensive but goes for longer distance per gallon.
No of gallons of Brand X gasoline obtained in $12 = 12/0.8 gallons
Distance travelled by Brand X in these gallons = (12/0.8) * 40 miles
No of gallons of Brand Y gasoline obtained in $12 = 12/0.75 gallons
Distance travelled by Brand X in these gallons = (12/0.75) * 36 miles
\(Difference = (\frac{12}{0.8}) * 40 - (\frac{12}{0.75}) * 36 = 12*4* [\frac{50}{4} - \frac{36}{3}] = 48 * (0.5) = 24 miles\)
_________________
Karishma
Veritas Prep GMAT Instructor
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