The average age of four boys A, B, C and D is 5 years and the average age of A, B, D and E is 6 years. C is 8 years old. The age of E is (in years) :
Answer & explanation
Correct answer: option 1
The average age of four boys A, B, C and D = 5 years
A + B + C + D = 20 years
C = 8 years
so, A + B + 8 + D = 20 years
A + B+ D = 12 years
The average age of A, B, D and E = 6 years
Now A + B + D + E = 24 years
A + B+ D = 12 years
E = 24 - 12 = 12 years.