The average age of four brothers is 15 years. If their fatheris included, the average is increased by 5 years. The age of the father (in years) is:
We are given that :Â the average age of four brothers is 15 years.
Therefore sum of ages of brothers = 4(15) =60 yearsÂ
Now when father is includedÂ
the average age becomes 20 yearsÂ
Therefore sum of ages of brothers and father = 5(20) = 100 yearsÂ
Therefore age of father = 100-60 = 40 years
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