The average of the ages of Sumit, Krishna and Rishabh is 43 and the average of the ages of Sumit, Rishabh and Rohit is 49. If Rohit is 54 years old, what is Krishna’s age?

A. 24 years

B. 36 years

C. 45 years

D. Cannot be determined

E. None of these

Answer: Option B

Solution(By Examveda Team)

Sumit + Krishna + Rishabh = 43 × 3 = 129.....(i)
Sumit + Rishabh + Rohit = 49 × 3 = 147.....(ii)
Subtracting (i) from (ii), we get:
Rohit - Krishna = 18
⇒ Krishna = 54 - 18 = 36