Yoshi is riding a bike-a-thon to raise money for his favorite charity the total distance of the bike-a-thon is 28.5 miles so far he has completed 1/10 of the bike-a-thon how many miles has yoshi biked

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?