Jane has read 108 pages of her book. kevin is reading the same book and has 80 pages left to read. if there are 200 pages in the book by how much percent is the number of pages left for jane greater then kevin

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?