[7:5] Two branch of tree bird sit in way if one bird of the first branch goes to second branch their ratio

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Two branch of tree bird sit in way if one bird of the first branch goes to second branch their ratio become equal and if bird from second branch goes to first branch ratio become double than first. what are there ratio in sitting?

7:5

7:4

5:2

none

Explanation:

If birds on 1st branch=x, 2nd branch=y

1st condition, x-1=y+1, x-y=2 ---(i) &

2nd condition, x+1=2(y-1), x-2y=-3 ---(ii)

Solving (i) & (ii), x=7, y=5.

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