1. Invitations were sent to 74 relatives for a family get-together. Only 67 relatives came. How many relatives did not come?   2. Robert weighs 19 kg. His mother is 50 kg. How much more is his mother's weight (in kg)?   3. Mr. Young will be 42 next year. His son is 32 years younger than him. How many years old is his son at present?   4. A family party has 46 adults, 18 boys, and 17 girls. How many more adults are there at the party than children?   5. Gary is 12 years old. His aunt is 42. How many years older than him is his aunt?