Idon’t know if i did this right can someone me pls?

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.

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect