Written proof

[u/kenjiqc]

Birds greeting one another and speaking. Blatent proof.

[u/Tbonetrekker76]

They were correct. There’s only one group and one extra bird.

Your way just adds extra steps.

X + y = 100

Y = X/2 + 1

Sub in, so X + X/2 + 1 = 100

[u/Sloofin → u/Tbonetrekker76]

Last line is unnecessary. It is simply x/2 +1=y