Duration: 1:42

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1

let No.of birds on tree 1 be = X
No.of birds on tree 2 be = Y

if one bird from tree2 comes to tree1 then
there are (X+1) birds on tree1 and (Y-1) birds on tree2
here tree1 population is double than tree2 population
X+1 = 2*(Y-1)
X+1=2Y-2
X=2Y-3 THIS IS ------EQUATION1


if one bird from tree1 comes to tree2 then
there are (X-1) birds on tree1 and (y+1) birds on tree2
here tree1 population will be equal to tree2 population
(X-1)=(Y+1)
X=Y+1+1
X=Y+2 this is------equation2
from equation1 and equation2
2Y-3=Y+2
2Y-Y=2+3
Y= 5
then X=Y+2
X=5+2
X=7
so population of tree1=7
Population of tree2 =5