Please solve. And thank you

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?

Mr. t has been dating his girlfriend for one year nine months and six days how many hours has mr. t been in a relationship

Apply distributive property to write equivalent equation 105×35m