SOLUTION: The average age of a group of five friends is 16. Three of the friends are the same age, one girl is one year older them and one girl is one year younger than them. How old is the
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Question 776560: The average age of a group of five friends is 16. Three of the friends are the same age, one girl is one year older them and one girl is one year younger than them. How old is the oldest friend? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! The average age of a group of five friends is 16. Three of the friends are the same age, one girl is one year older them and one girl is one year younger than them. How old is the oldest friend?
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Let those with the same age be "x years old".
The older girl is "x+1 years old"
The youngest girl is "x-1 years old"
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Equation::
[x+1 + 3x + x+1]/5 = 16
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(5x)/5 = 16
x = 16
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Ans: oldest = x+1 = 17 yrs. old
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Cheers,
Stan H.
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