1) (n^2)y = 100
2) n= 5 and y = 4
This question is from Total GMAT Math
. The statement (1) provides that (n^2)y = 100 which implies that n(y^(1/2)) can be either 10 or -10. However, the solution provided by the book states that the above value is only 10. Hence I chose B, sine the statement (1) can be both 10 or -10. Is my approach incorrect?
The official answer is D.
Thanks in advance for your expertise!
(x/y)power(1/2) = n
x/y = n square
x = y. n square
1. y.nsquare = 100
2. values for Y and N are given, then this is sufficient too...
so my ANSWER is D
Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat
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