Practice Test Discussion

Q)

The average of five numbers is 56. If the average of first four numbers is 54, what is the value of the fifth number?

[BOI (PO), 2010]

    • Explanation

    Given,

    Total sum of five numbers = 56×5=280

    Sum of first four numbers = 4×54

    = 216

    ∴ Value of fifth number =280-216

       =64

    Hence, Option D is correct.

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