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from gmatprep

This topic has 2 member replies
d77 Newbie | Next Rank: 10 Posts Default Avatar
Joined
13 Dec 2006
Posted:
6 messages

from gmatprep

Post Wed Dec 13, 2006 6:20 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k

    1. k>35
    2.the unit sigit of k is greater then 5


    why is
    2

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    zipper123 Newbie | Next Rank: 10 Posts Default Avatar
    Joined
    10 Oct 2006
    Posted:
    8 messages
    Post Wed Dec 13, 2006 7:14 am
    d77 wrote:
    If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k
    1. k>35
    2.the unit sigit of k is greater then 5
    why is
    2
    1) is not sufficient, because the k can be 37 or 42, which does not provide a unique answer.

    Whereas:
    2) consider the followings:
    If the unit digit is less then 5,
    --> k's tens digit is 4
    if the unit digit is more than 5,
    --> k's tens digit is 3

    Therefore condition 2) is sufficient, because it restricts the tens digit to be 3 only.

    _________________
    ==Still Working==

    d77 Newbie | Next Rank: 10 Posts Default Avatar
    Joined
    13 Dec 2006
    Posted:
    6 messages
    Post Thu Dec 14, 2006 11:15 am
    Very Happy

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