Un comerciante compra una pieza de 45m

The equation respenting the left table is

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?

Find the greatest common factor of the followig monomials 46g^2h and 34g^6h^6