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I. Insuff. M can be 7 * 6, N can be 15*6 or M = 7*8, N= 15*8 II. Suff. M = 7*(-3), N =15*(-3) or M = 7*(-5), N=15*(-5) Either way the product is always positive.

Last edited by packem on 24 May 2009, 10:11, edited 1 time in total.

If m/n=7/15, mn=? 1). M and n are positive integers not sufficient

2). The greatest common factor of m and n is 3 from this, we can find that at least m is (7*3)=21, then n must be 45 --> calculate the outcome of m.n Because m/n=7/15, so if we want to find another greater couples, we should multiply each m & n with a same integer --> their greatest common factor will be greater than 3 --> eliminate this possibility If N=-21 and M=-45, then the outcome of m.n is still the same