Question

Three years ago, the average age of A and B was 18 yr. When C joins them, the average becomes 22 yr. How old (in years) is C now?

• A. 24 yr
• B. 27 yr
• C. 28 yr
• D. 30 yr
• E. None of these

Answer 1

The correct option is A 24 yr

Here, total present ages of A and B
= 18 $\times$ 2 + 6 = 42 yr
Now, total ages of A, B and C = 3 $\times$ 22
= 66 yr
$\therefore$ C's age = 66 - 42
= 24 yr