Prep test I

If x and y are positive integers, what is the value of xy?

I the greatest common factor of x and y is 10

II the list common multiple of x and y is 180

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parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 am; Thanked: 146 times; Followed by:2 members

Re: Prep test I

by parallel_chase » Fri Sep 12, 2008 8:21 pm

Oxana wrote:If x and y are positive integers, what is the value of xy?

I the greatest common factor of x and y is 10

II the list common multiple of x and y is 180

Answer should be C.

Product of 2 numbers = LCM * GCD

xy = LCM (x&y) * GCD (x&y)

xy = 10*180 = 1800

Hope this helps.

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