1. Invitations were sent to 82 relatives for a family get-together. Only 74 relatives came. How many relatives did not come?   2. Peter 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 35 years younger than him. How many years old is his son at present?   4. A family party has 42 adults, 6 boys, and 16 girls. How many more adults are there at the party than children?   5. Adam is 13 years old. His aunt is 39. How many years older than him is his aunt?