Jamie mixed 2/3 bottle of cranberry juice and 5/6 bottle of orange juice. which shows how to compare 2/3 and 5/6?

2/3 < 5/6
5/6< 2/3
5/6=2/3
2/3> 5/6

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?