Zack is wants to make a profit of more than $300 for painting 4 identical rooms. the profit he makes is equal to the amount he is paid minus the cost of supplies. the cost of supplies is $32.40 for each room. which inequality and solution represent the dollar amount n that zack must be paid for each room, if he is to make a profit of more than $300

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?