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Maria’s brother, Joe, is three years less than twice Maria’s age. Joe is 19 years old. How old is Maria?Jeff’s age is 6 more than 3 times Amber’s age. If Jeff is 27, how old is Amber?Alvin is 8 years younger than Elga. The sum of their ages is 72 . What is Elga's age?Mark is 7 years older than Mariah. In 4 years the sum of their ages will be 77. How old is Mark now?Carla is now twice as old as Jennifer. Seven years ago, the sum of their ages was 16. How old is each girl now?