The average age of A, B, C, D and E is 28 years. The average age of D and E is 25 years. What is the average age of A, B and C ?



Answer:

Here 5 persons’ averageĀ  age is = 28 Years.
That means their total age = 5 X 28 = 140 Years.
similarly, average age of two persons (D and E) is 25 years.
So their total age = 25 X 2 = 50 Years.
here 140 years is the total age of 5 persons and 50 years is the total age of 2 persons.
So obviously, the total age of A, B and C = Total age ofA,B,C, D, E – Total age of D and E
= 140-50 = 90 years.
But here we need average age of these 3 persons
That is 90/3 = 30 years.

Answer: 30 Years.




Shortcut Method :

((5 X 28) – (2 X 25)) / 3
= (140-50)/ 3 = 90/3
= 30 Years

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