1.a crew took 24 days to complete 40% of a job; how much additional ti
me to complete the job? 34,35,36 or 38 days?
2.a gas tank is 3.6 full. it takes 90 gallons to fill the tank. the total number of gallons the tank can hold is? 50, 89, 144 or 225?

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?