Antonia had s stickers. She kept 8 and divided the rest equally among 3 friends. Use values from the box to write an expression to represent the situation. Answer should be written in order of what A equals, B equals and C equals with a space in between each. No commas just the value for each letter, i. e., 3 8 s.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?