Asilo is shaped like a cylinder with a cone on top. the radii of the bases of the cylinder and cone are both equal to 8 feet. the height of the cylindrical part is 25 feet and the height of the cone is 6 feet. what is the volume of the entire silo?

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?