Question 91657: Carl is a years old. His sister Jenny is six more than twice his age. What is the average of their ages? Answer by bucky(2189) (Show Source):
You can put this solution on YOUR website! Carl is A years old.
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His sister is twice his age (2A) plus 6 years. So she is 2A + 6.
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To average their two ages, add their ages together and divide by 2. Adding their ages results
in:
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A + 2A + 6 = 3A + 6
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Then dividing by 2:
.
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If you would like you can also divide each of the terms in the numerator by 2 and express the
answer as:
.
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Hope this helps you to understand the problem a little better.
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