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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?

Re: If (x/y)^(1/2)=n, what is the value of x? [#permalink]

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07 Apr 2012, 02:06

andrewh wrote:

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!

Given that (x/y)power(1/2) = n x/y = n square x = y. n square

now,

1. y.nsquare = 100 sufficient

2. values for Y and N are given, then this is sufficient too...

so my ANSWER is D _________________

Regards, Harsha

Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat

Re: If (x/y)^(1/2)=n, what is the value of x? [#permalink]

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23 May 2013, 06:37

reddevil00 wrote:

If (x/y)^(1/2)=n, what is the value of x?

(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!

yes, what u have misses is : l x l is +/- and again the same way x^2 is always positive but a root need not be, here we have square only dude.

gmatclubot

Re: If (x/y)^(1/2)=n, what is the value of x?
[#permalink]
23 May 2013, 06:37

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