The average age of four boys A, B, C and D is 7 years and the average age of A, B, D and E is 8 years. C is 12 years old. The age of E is (in years) :
Answer & explanation
Correct answer: option 2
The average age of four boys A, B, C and D = 7 years
A + B + C + D = 28 years
C = 12 years
so, A + B + 12 + D = 28 years
A + B+ D = 16 years
The average age of A, B, D and E = 8 years
Now A + B + D + E = 32 years
A + B+ D = 16 years
E = 32 - 16 = 16 years.