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)
Let x=12.
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.
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