Keisha must choose a number between 61 and 107 that is a multiple of , 4, 7and 14. Write all the numbers that she could choose. If there is more than one number, separate them with commas.

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?