120) will be DISTRIBUTED between A and B as their shares of profit.
Ratio of profits = Ratio of investments So, A : B = 3000 : 4000 = 3 : 4
A's share = 120 + (N - 120) x 3/7
120 + (N - 120) x 3/7 = 390
(N - 120) x 3/7 = 390 - 120 = 270
N - 120 = (270 x 7)/3 = 630
∵ B's share = 4/7 x (N - 120)
= (4/7) x 630 = 360