1. Invitations were sent to 80 relatives for a family get-together. Only 50 relatives came. How many relatives did not come?   2.  There are five members in Brian's family. Their total weight is 287 kg. His own weight is 35 kg. How many kilograms do the other four members weigh?   3. Mr. Young will be 66 next year. His son is 26 years younger than him. How many years old is his son at present?   4. A family party has 106 adults, 29 boys, and 21 girls. How many more adults are there at the party than children?   5. For Christmas, Mr. Hurt gave $112 to his two sons. He gave $66 to the elder son. How many dollars did he give the younger son?