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Arithmetic : Rounding

This topic has 1 expert reply and 0 member replies
anirudhbhalotia Master | Next Rank: 500 Posts
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Arithmetic : Rounding

Post Thu Jan 13, 2011 10:25 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    d=0.43t7

    If t denotes the thousandths digit in the decimal representation of d above, what digit is t ?

    1. If d were rounded to the nearest hundredth, the result would be 0.44.

    2.If d were rounded to the nearest thousandth, the result would be 0.436.


    OA - B

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    Post Thu Jan 13, 2011 11:10 pm
    anirudhbhalotia wrote:
    d=0.43t7

    If t denotes the thousandths digit in the decimal representation of d above, what digit is t ?

    1. If d were rounded to the nearest hundredth, the result would be 0.44.
    2.If d were rounded to the nearest thousandth, the result would be 0.436.
    d = 0.43t7

    Statement 1: d rounded to the nearest hundredth = 0.44
    The hundredths digit of d is 3.
    But rounding to nearest hundredth makes it 4.
    Hence, the thousandth digit of d, i.e. ≥ 5.

    Not sufficient

    Statement 2: d rounded to the nearest thousandth = 0.436
    The thousandths digit of d is t and the ten-thousandth digit of d is 7.
    Thus, rounding to the nearest thousandth will increase the thousandth digit by 1.
    Hence, the thousandth digit of d, i.e. t = (6 - 1) = 5

    Sufficient

    The correct answer is B.

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