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A certain brand of gasoline costs $1.25 per gallon. Using

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by AAPL » Fri Aug 17, 2018 9:40 am
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A certain brand of gasoline costs $1.25 per gallon. Using this gasoline, if a car averages 30 miles to the gallon, what is the cost of the gasoline needed for the car to travel 120 miles?

A. $4.50
B. $5.00
C. $5.50
D. $6.00
E. $6.50

OA B.
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by [email protected] » Sat Aug 18, 2018 6:00 pm
Hi All,

We're told that a certain brand of gasoline costs $1.25 per gallon. We're asked if a car averages 30 miles per gallon, what is the cost of the gasoline needed for the car to travel 120 miles. This is a multi-step 'Rate' question - and the math involved can be done in a number of different ways. We can actually start with the end result, work 'backwards' to find the number of gallons and then find the total cost of the gasoline.

120 miles is 4 "sets" of 30 miles. Since the car averages 30 miles per gallon, we would need 120/30 = 4 gallons to travel 120 miles. Since gasoline costs $1.25/gallon, the cost of the 4 gallons would be (4)($1.25) = $5.00

Final Answer: B

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by Jeff@TargetTestPrep » Mon Aug 20, 2018 10:41 am
AAPL wrote:GMAT Prep

A certain brand of gasoline costs $1.25 per gallon. Using this gasoline, if a car averages 30 miles to the gallon, what is the cost of the gasoline needed for the car to travel 120 miles?

A. $4.50
B. $5.00
C. $5.50
D. $6.00
E. $6.50
The car needs 120/30 = 4 gallons to travel 120 miles, so the cost is 4 x 1.25 = 5 dollars.

Answer: B

Jeffrey Miller
Head of GMAT Instruction
[email protected]

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by fskilnik@GMATH » Mon Aug 20, 2018 11:55 am
<p>
</p>
A certain brand of gasoline costs $1.25 per gallon. Using this gasoline, if a car averages 30 miles to the gallon, what is the cost of the gasoline needed for the car to travel 120 miles?

A. $4.50
B. $5.00
C. $5.50
D. $6.00
E. $6.50
The solution below follows the "units control", one of the most powerful tools of the <b>GMATH</b> method. &nbsp;(The arrows denote <i>licit converters</i>, as explained in the course.)

Image
Fabio Skilnik :: GMATH method creator ( Math for the GMAT)
English-speakers :: https://www.gmath.net
Portuguese-speakers :: https://www.gmath.com.br
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by fskilnik@GMATH » Mon Aug 20, 2018 12:06 pm
<p>
</p>
A certain brand of gasoline costs $1.25 per gallon. Using this gasoline, if a car averages 30 miles to the gallon, what is the cost of the gasoline needed for the car to travel 120 miles?

A. $4.50
B. $5.00
C. $5.50
D. $6.00
E. $6.50
The solution below follows the "units control", one of the most powerful tools of the <b>GMATH</b> method. &nbsp;(The arrows denote <i>licit converters</i>, as explained in the course.)
Image
Fabio Skilnik :: GMATH method creator ( Math for the GMAT)
English-speakers :: https://www.gmath.net
Portuguese-speakers :: https://www.gmath.com.br
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Join the discussion