1. is 20 9/11 closer to 20 or 21? 2. is 18 3/10 closer to 18 or 19?

3. is 10 3/7 closer to 10 or 11?

4. is 22 2/9 closer to 22 or 23?

Pls help

What dimensions can créate more than one triangle ?

What is the total area of the figure?

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?