1. Invitations were sent to 56 relatives for a family get-together. Only 53 relatives came. How many relatives did not come?   2. Mark weighs 18 kg. His mother is 63 kg. How much more is his mother's weight (in kg)?   3. Mr. Moore will be 37 next year. His son is 26 years younger than him. How many years old is his son at present?   4. A family party has 26 adults, 5 boys, and 16 girls. How many more adults are there at the party than children?   5. Ronnie is 14 years old. His aunt is 36. How many years older than him is his aunt?