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Brand X Brand Y Miles per gallon 40 36 Cost per gallon $0.80

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Brand X Brand Y Miles per gallon 40 36 Cost per gallon $0.80 [#permalink] New post 17 May 2007, 06:57
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Brand X Brand Y
Miles per gallon 40 36
Cost per gallon $0.80 $0.75

The table above gives the gasoline costs and consumption rates for a certain driven at 50 miles per hour, using each of two brands of gasloine. How many miles further can the car be driven at this speed on $12 worth of brand X gasoline than on $12 worth of brand Y gasoline?

A. 20
B. 24
C. 84
D. 100
E. 104 [/u]
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Re: prep question [#permalink] New post 17 May 2007, 07:12
Jamesk486 wrote:
Brand X Brand Y
Miles per gallon 40 36
Cost per gallon $0.80 $0.75

The table above gives the gasoline costs and consumption rates for a certain driven at 50 miles per hour, using each of two brands of gasloine. How many miles further can the car be driven at this speed on $12 worth of brand X gasoline than on $12 worth of brand Y gasoline?

A. 20
B. 24
C. 84
D. 100
E. 104 [/u]


(B) it is

(12/0.8)*40 - (12/0.75)*36 = 24
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Re: prep question [#permalink] New post 17 May 2007, 07:13
Jamesk486 wrote:
Brand X Brand Y
Miles per gallon 40 36
Cost per gallon $0.80 $0.75

The table above gives the gasoline costs and consumption rates for a certain driven at 50 miles per hour, using each of two brands of gasloine. How many miles further can the car be driven at this speed on $12 worth of brand X gasoline than on $12 worth of brand Y gasoline?

A. 20
B. 24
C. 84
D. 100
E. 104 [/u]


first we need to find out how many gallons of each brand we can buy
12/0.8=15gallons of X and 12/0.75=16gallons of Y
second the distance we can go
15*40=600 for X and 16*36=576 for Y
the difference is 600-576=24

Answer is B
Re: prep question   [#permalink] 17 May 2007, 07:13
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Brand X Brand Y Miles per gallon 40 36 Cost per gallon $0.80

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