PLEASE HELP- Brandon went to the Montgomery County Fair. There was a cost of $15.00 to park his car and tickets cost $.75 each. When Brandon left the fair he could not remember how many tickets he purchased but he did remember the total amount of money he spent at the fair. Write a function that will help Brandon determine the amount of tickets he purchased based on the total amount of money he spent at the fair.

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?