SOLUTION: the average of 5 members family age is 18 years . if grandfather is included the average is 12 years. what is the age of grandfather?

Question 764320: the average of 5 members family age is 18 years . if grandfather is included the average is 12 years. what is the age of grandfather?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
, find g.

Why would a grandfather, of expected age ABOVE 30, make a decrease of the average age for the group when the average age without grandfather is already younger? The problem description just makes no realistic sense.

The problem description is wrong.
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