1. Invitations were sent to 28 relatives for a family get-together. Only 22 relatives came. How many relatives did not come?   2. Bill weighs 25 kg. His mother is 59 kg. How much more is his mother's weight (in kg)?   3. Mr. Nelson will be 36 next year. His son is 27 years younger than him. How many years old is his son at present?   4. A family party has 25 adults, 5 boys, and 5 girls. How many more adults are there at the party than children?   5. Ronald is 11 years old. His aunt is 39. How many years older than him is his aunt?