Hillary wants to determine what percent of her trail mix is chocolate pieces, so she counts out exactly how many of each item are in her bag. There are 22 raisins, 16 chocolate pieces, and 20 peanuts. What percent of pieces in the trail mix are chocolate?

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?