Question

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

• A. 45 yrs
• B. 24 yrs
• C. 36 yrs
• D. Cannot be determined
• E. None of these

Answer 1

The correct option is C 36 yrs

Here, total ages of Sumit, Krishna and Rishabh
= 3 $\times$ 43 = 129 yrs
Total ages of Sumit, Rishabh and Rohit
= 3 $\times$ 49 -147 yrs
Now, Rohit's age = 54 yrs
Then, Sumit and Rishab's age = 147 - 54
= 93 yrs
$\therefore$ Krishna's age = 129 — 93 yr = 36 yrs