1. Invitations were sent to 48 relatives for a family get-together. Only 46 relatives came. How many relatives did not come?   2. Ronald weighs 21 kg. His mother is 57 kg. How much more is his mother's weight (in kg)?   3. Mr. Baker will be 41 next year. His son is 28 years younger than him. How many years old is his son at present?   4. A family party has 52 adults, 13 boys, and 10 girls. How many more adults are there at the party than children?   5. Brian is 14 years old. His aunt is 40. How many years older than him is his aunt?