Economist GMAT
A group of x people is practicing levitation yoga. One-fourth of the people rise up in the air, and after a while, 3 of them come back down. How many people are now practicing yoga on the ground?
A. 2/3*(x+3)
B. (3/4)(x+4)
C. 3(4x+4)
D. 3(x+4)
E. 4(3x+4)
OA B
A group of x people is practicing levitation yoga. One-fourt
This topic has expert replies
GMAT/MBA Expert
- Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
- Location: Vancouver, BC
- Thanked: 5254 times
- Followed by:1268 members
- GMAT Score:770
One-fourth of the people rise up in the airAAPL wrote:Economist GMAT
A group of x people is practicing levitation yoga. One-fourth of the people rise up in the air, and after a while, 3 of them come back down. How many people are now practicing yoga on the ground?
A. 2/3*(x+3)
B. (3/4)(x+4)
C. 3(4x+4)
D. 3(x+4)
E. 4(3x+4)
If 1/4 of the x people are in the AIR, the remaining 3/4 of the x people are on the GROUND
So, (3/4)x = number of people on the GROUND
After a while, 3 of them come back down.
So, the number of people on the GROUND is increased by 3
So, now (3/4)x + 3 = number of people on the GROUND
Check the answer choices . . . not there!
Or so it seems.
If we take answer choice B, (3/4)(x+4), and expand it, we get: (3/4)x + 3
PERFECT!
Answer: B
Cheers,
Brent
- GMATGuruNY
- GMAT Instructor
- Posts: 15539
- Joined: Tue May 25, 2010 12:04 pm
- Location: New York, NY
- Thanked: 13060 times
- Followed by:1906 members
- GMAT Score:790
Let x=12.AAPL wrote:Economist GMAT
A group of x people is practicing levitation yoga. One-fourth of the people rise up in the air, and after a while, 3 of them come back down. How many people are now practicing yoga on the ground?
A. 2/3*(x+3)
B. (3/4)(x+4)
C. 3(4x+4)
D. 3(x+4)
E. 4(3x+4)
Since 1/4 of the people rise up, the number who rise up = (1/4)(12) = 3.
Since 3 people come back down, EVERYONE who rises up comes back down, with the result that all 12 people are practicing yoga on the ground.
How many people are now practicing yoga on the ground?
The correct answer must yield 12 when x=12.
Only B works:
(3/4)(12+4) = (3/4)(16) = 3*4 = 12.
The correct answer is B.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3