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Re: x and y

by x2suresh » Fri Feb 20, 2009 11:02 am
4meonly wrote:OA [spoiler]soon :-)[/spoiler]

Image
[/spoiler]
15
B


0.02<x<0.1 -- > 50>1/x>10

y-x/xy = 1/x - 1/y = (50 to 10) - (1/10000)
=~ betwen 50 and 10

only 15 fits
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by awesomeusername » Fri Feb 20, 2009 4:02 pm
Wow, nice work man. I never would have figured to do that!
Constant dripping hollows out a stone.
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Re: x and y

by Ossa » Fri Feb 20, 2009 7:03 pm
Hi,

Here is an easy way:
Since y is much larger than x, then the equation can be simplified to y/xy which is equal to 1/x.
Accordingly the value of the equation is between 1/.02 and 1/.1, or between 50 and 10, so the answer is 15 (B).

4meonly wrote:OA [spoiler]soon :-)[/spoiler]

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Ossa Elhadary, PhD, CISA, PMP
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