Four years ago the average age of A, B and C was 25 years. Five years ago the average of B and C was 20 years. A’s present is?
- 60 years
- 15 years
- 62 years
- 37 years
Explanation
Four years ago, the average age of A, B, and C was 25 years.
This means that the total age of A, B, and C four years ago was 25 x 3 = 75 years.
Since then, all three have aged 4 years, so their total age now is 75 + 4 + 4 + 4 = 87 years.
Five years ago, the average age of B and C was 20 years.
This means that the total age of B and C five years ago was 20 x 2 = 40 years.
Since then, both B and C have aged 5 years, so their total age now is 40 + 5 + 5 = 50 years.
Now, we know that the total age of A, B, and C is 87 years, and the total age of B and C is 50 years.
So, A's current age is 87 - 50 = 37 years.
The correct answer is: 37 years
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