1. Invitations were sent to 77 relatives for a family get-together. Only 72 relatives came. How many relatives did not come?   2. Warren weighs 20 kg. His mother is 59 kg. How much more is his mother's weight (in kg)?   3. Mr. Hurt will be 45 next year. His son is 32 years younger than him. How many years old is his son at present?   4. A family party has 7 adults, 3 boys, and 2 girls. How many more adults are there at the party than children?   5. Peter is 12 years old. His aunt is 38. How many years older than him is his aunt?