Another one plz help

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

What sums are equal to 6/12? choose all answers that are correct a.6/12+6/12+6/12+6/12+6/12+6/12 b.2/12+1/12+1/12+2/12 c.5/12+1/12 d.1/12+1/12+1/12+3/12 plz : )

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.