Im supposed to find x for this arc but i don't really understand it

Do 12/14 and 8/10 have the same value? explain your answer.

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

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?