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Pearson Vue CAT Quant PS-need help [#permalink]
01 Jan 2006, 03:13

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Hi all, I just took the first GMATPREP cat yesterday and am disappointed as they dont have explanations for your wrong answers. If any of you know how to solve this one it would really help. Thanks and Happy New Year!!!

If y and n are positive intergers and 450y=n^3 which of the following is an interger.
I. y/(3)(2^2)(5)

II. y/(3^2)(2)(5)

III. y/(3)(2)(5^2)

I simply cannot figure out what 450y=n^3 is. Any ideas??? Thank you.

since 450y=n^3 and y and n are positive integers, 450y should contain third powers of all factors for n^3 to be an integer. You factor out 450, and see that it is 3^2x5^2x2 so you need Y to contain 2^2x3x5 as factors
hope it helps

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