WHAT IS 3³ . (12 - 2) ÷ 2?

Answer this question only if you know the answer! 30 points and

The difference between tax advoidance and tax evasion

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?