The sum of Annie's, Bert's, and Chris's ages is 75. Annie is older than Bert by the same number of years that Bert is older than Chris. When Bert is as old as Annie is now, Annie will be three times as old as Chris is now. Let a represent Annie's age, b represent Bert's age, and c represent Chris's age. Set up an appropriate system of linear equations that can be used to determine each of their ages. Condition Equation The sum of Annie's, Bert's, and Chris's ages is 75. Correct: Your answer is correct. Annie is older than Bert by the same number of years that Bert is older than Chris. Correct: Your answer is correct. When Bert is as old as Annie is now, Annie will be three times as old as Chris is now. $$ Incorrect: Your answer is incorrect. Solve the system of equations. What are their ages