I need this done ASAP.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

If i have 20$ and i gave 5$ away how much i got

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?