If 12x + 2y is 80% of 5y, what is the value of x/y ?
A) 1/6
B) 1/4
C) 2/5
D) 1/2
E) 5/8
Answer: A
Source: www.gmatprepnow.com
Difficulty level: 550-600
If 12x + 2y is 80% of 5y, what is the value of x/y ?
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- Brent@GMATPrepNow
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First translate the given information into an equation
12x + 2y = 0.80 * 5y
Then simplify this a bit.
12x + 2y = 4y
12x = 2y
6x = y
The question is asking for x/y. We now can substitute 6x for y to get x/6x. The x's cancel out to 1/6 or choice A.
Take care,
Sionainn
12x + 2y = 0.80 * 5y
Then simplify this a bit.
12x + 2y = 4y
12x = 2y
6x = y
The question is asking for x/y. We now can substitute 6x for y to get x/6x. The x's cancel out to 1/6 or choice A.
Take care,
Sionainn
BA - Stanford University, MPP - Harvard University
Instructor, tutor for Princeton Review and Airbnb host
In other words a blend of Jamie Escalante from Stand and Deliver, Julie from The Love Boat, and Schneider the Super from One Day at a Time.
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Instructor, tutor for Princeton Review and Airbnb host
In other words a blend of Jamie Escalante from Stand and Deliver, Julie from The Love Boat, and Schneider the Super from One Day at a Time.
Curious How You'll Score? Take a FREE GMAT® practice test or sample class
Ready to Prep? Exclusive discounts for Beat The GMAT® members HERE
GMAT/MBA Expert
- Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
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- GMAT Score:770
Sionainn's solution is perfect. It's the same approach I'd use.Brent@GMATPrepNow wrote:If 12x + 2y is 80% of 5y, what is the value of x/y ?
A) 1/6
B) 1/4
C) 2/5
D) 1/2
E) 5/8
Answer: A
Source: www.gmatprepnow.com
Difficulty level: 550-600
However, here's another approach (for kicks!)
Let's try to find some values for x and y that satisfy the given information: 12x + 2y is 80% of 5y
Let's first let y = 20, and then figure out what value of x is needed.
We get: 12x + 2(20) is 80% of 5(20)
Simplify: 12x + 40 is 80% of 100
Evaluate: 12x + 40 = 80
So: 12x = 40
Solve: x = 40/12 = 10/3
So, x = 10/3 and y = 20 satisfies the given information.
What is the value of x/y ?
x/y = (10/3)/20
= (10/3)(1/20)
= 10/60
= 1/6
Answer: A
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- Jeff@TargetTestPrep
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We can create the equation:Brent@GMATPrepNow wrote:If 12x + 2y is 80% of 5y, what is the value of x/y ?
A) 1/6
B) 1/4
C) 2/5
D) 1/2
E) 5/8
12x + 2y = (4/5)(5y)
12x + 2y = 4y
12x = 2y
x/y = 1/6
Answer: A
Jeffrey Miller
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