Question

there are birds on two trees.if a bird flew from first to second tree then there is equal number of birds in each tree.however if a bird flew from second to first tree then the birds on the first tree are double than birds on second second tree.how many birds are on each tree

Answer 1

Let birds on first tree=x
Birds on second tree=y
x-1=y+1
x-y=2              x=y+2
x+1=2(y-1)
x+1=2y-2
x-2y=-3
y+2-2y=-3
-y=-5
y=5
x=7
First tree had 7 birds
Second tree had 5 birds

Answer 2

Answer:

Let birds on first tree = x

and ,second tree=y

x-1=y+1

x-y=2

x+1=2(y-1)

x+1=2y-2

x-2y=-3

y+2-2y=-3

-y=-5

y=5

x=7

First tree had 7 birds

And, second tree had 5