Practice Test Discussion

Q)

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

[SBI (PO), 2008]

    • Explanation

    Given,

    Total ages of Sumit, Krishna and Rishabh = 3×43=129

    Total ages of Sumit, Rishabh and Rohit = 3×49=147

    Now, Rohit's age = 54 yr

    Then, Sumit and Rishab's age =147-54

         =93 yr

    ∴ Krishna's age = 129-93 yr = 36yr

    Hence, Option C is correct.

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