Gail Regalado broke her arm while playing soccer. The injury resulted in many medical bills. She has a health insurance plan with a $ 700 deductible. The plan covers 90 percent of her hospital charges. Regalado's recent health care costs include 5 physician visits with a co-payment of $ 20 per visit, 20 physical therapy visits with a co-payment of $ 25 per visit, and a hospital bill of $ 9,200. A $ 150 hospital admission fee is not covered by her insurance. What amount did she pay?

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?