1. Invitations were sent to 44 relatives for a family get-together. Only 36 relatives came. How many relatives did not come?   2. Steve weighs 22 kg. His mother is 61 kg. How much more is his mother's weight (in kg)?   3. Mr. Lee will be 35 next year. His son is 25 years younger than him. How many years old is his son at present?   4. A family party has 16 adults, 7 boys, and 7 girls. How many more adults are there at the party than children?   5. Herbert is 13 years old. His aunt is 33. How many years older than him is his aunt?