1. Invitations were sent to 66 relatives for a family get-together. Only 64 relatives came. How many relatives did not come?   2. Herbert weighs 19 kg. His mother is 59 kg. How much more is his mother's weight (in kg)?   3. Mr. Hick will be 36 next year. His son is 26 years younger than him. How many years old is his son at present?   4. A family party has 40 adults, 15 boys, and 11 girls. How many more adults are there at the party than children?   5. Jack is 14 years old. His aunt is 41. How many years older than him is his aunt?