The top question is already filled out (if you see an error in the top one can you let me know in the comments only please?) and what I need to answer is the bottom question, can any of you help me, please?

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?