Bunuel wrote:
Bumping for review and further discussion*. Get a kudos point for an
alternative solution!
*New project from GMAT Club!!! Check
HEREQuestion:
Let the capacity of X be C
so, X= 2C/7 and Y>X
If n is the quantity of water taken from Y and put into X
Then,
Y-n = X+n
2n = Y-X => n = (Y-X)/2
n is the quantity that needs to be transferred.
The % will (n/Y) * 100 %
(Note, that we already have one equation with X and C, and we just need one more involving Y and C, if we can get it out of any of the statements, it should be enough to solve)
Now lets take a look at the statements :
(1) If all the water currently in Pool Y were transferred to Pool X, Pool X would be filled to 6/7 of its capacity.
Y+X = 6C/7
and we know that X=2C/7
Hence, Y=4C/7
n = (Y-X)/2 = C/7
Therefore, % of water = (C/7)/(4C/7) *100
=100/4
=25%
Sufficient.
(2) Pool X has a capacity of 14,000 gallons.
We need another relation in Y and C or Y and X to be able to solve, not sufficient.
Ans: A
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