Subnet plan with efficient use of a range of ip adresses

Question

Good morning, so basically I am working with Packet Tracer atm and have 3 subnet plans assigned(management(104users), staff(43 users) and admin(35 users)). I have an ip address range of:38.191.0.0 and subnet mask of 255.255.255.0. I want to produce that subnet plan but with the most efficient use of the ip address range provided above. Could anyone give me a brief idea of how to transform that range to the most efficient use of the IP addresses? Thank you very much. The diagram looks as follows:

Answer 1

(Answering in anticipation of this getting moved to a different SE site)

Given the size of your three groups (104, 43, 35) the only reasonable split is to allocate each of them to the next higher power of two, specifically (128, 64, 64) making that a /25 and two /26 blocks with nothing left over.

Note that this gives you 22 spare addresses in the first block, 19 in the second and 27 in the last.

p.s. is 38.191.0.0/24 really your netblock?