How many 2/5’s are in 5

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?

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

X=4 / y=100 if x=10 then what is y=?