Someone help me with this simple math

[Joost]

You're an effing moron

Manager has 25 dollars left.
Kid 1 keeps 2 dollars, so has 2 USD left, and gets another dollar when dividing
Kid 2 gets 1 dollar from dividing
Kid 3 gets 1 dollar from dividing

25+2+1+1+1= 30

Or from your side

9 + 9 + 7= 25