So basically, i need help with dividing the number. I have for example 20 hours(A1) which have to be divided into 8h + the rest. So, 8(B2)+8(B3)+4(B4) hours, and I have no idea how to come to that. I have tried few things, but I can only divide it by 8 and it doesn't go anywhere from that. I would be REALLY helpful if somebody would explain it to me, because i need to figure this out, urgently !

Thank you so much for your help guys (and girls )

Cheers, Lana