Tom had $8,153 in his bank account he deposited another $847 into the account he used all his money to buy 100 identical cameras he sold the cameras for $150 each. how much did tom earn from selling each camera?

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?