SOLUTION: Carl is <i>a</i> years old. His sister is 6 more than twice his age. What is the average of their ages?

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Question 211115: Carl is a years old. His sister is 6 more than twice his age. What is the average of their ages?
Answer by math problem solving(30) About Me  (Show Source):
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Carl's age is a.
His sister's age in terms of a is 2a + 6
Their average is
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