SOLUTION: Express the average of three sisters in the terms of the age (a) of the firstborn (in years) if the second was born 5 years after the first and the third was born 5 years after the

Question 904605: Express the average of three sisters in the terms of the age (a) of the firstborn (in years) if the second was born 5 years after the first and the third was born 5 years after the second.
I've tried it a bunch of different ways and can't figure out the correct answer. Please help!
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
the age of the firstborn (in years) :
the second was born years after the first (five years younger):

and the third was born years after the second:
the average of three sisters in the terms of the age:
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