Practice Test Discussion

Q)

What approximate value should come in place of the question mark (?) in the given questions?

(13.96)²-(15.03)²+(18.09)²-32.65=?

[PSB (PO), 2010]

    • Explanation

    Given,

    (13.96)²-(15.03)²+(18.09)²-32.65=?

    It can also be approximated as

    (14)²-(15)²+(18)²-2=?

    = 196-225+324-32

    = 196+324-225-32

    = 520-257

    = 263 ≈ 264

    Hence, option B is correct.

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