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David’s Great Grampa’s birthday is coming up, and David is wondering how the candles will fit on the cake. He doesn’t even know exactly how old Great Grampa will be. “Well,” says David’s mother when he asks her, “he’ll be more than 7 times your age.” Aunt Jessie says, “I know he is younger than Great Aunt Sarah, and she was born on February 17, 1920.” “Great Gramp,” David asks on the telephone, “how old were you when you were half as old as you are going to be this birthday?” “Wrong question,” says Great Grampa with a chuckle. “On my birthday, my age will not be an even number, but it will be divisible by 3.” Finally, David asks his second cousin Jake. “Oh, Great Grampa’s very old,” says Jake. “He’s going to be more than 3 times as old as I am, and I’m twice your age plus 6.” David is 11. How old will Great Grampa be on his upcoming birthday?
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