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GCD

by ketkoag » Sat May 30, 2009 4:24 am
m and n are integers, m*n=?
1) m/n=7/13
2) The greatest common divisor of m and n is 3

IMO: C please correct me if i am wrong.
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Source: — Data Sufficiency |
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by ssmiles08 » Sat May 30, 2009 4:48 am
I got C too
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by rahulg83 » Sat May 30, 2009 10:32 am
Yes C is the right choice.
Consider m = 13*k (k any integer)
n = 7*k (k any integer), note that 13 and 7 are prime.
Only way for the GCD to be equal to 3 is that m=13*3 and n=7*3
therefore m*n can be found using both statements but not by either 1st or 2nd
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