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500 DS

This topic has 2 member replies
dunkin77 Master | Next Rank: 500 Posts Default Avatar
Joined
01 Apr 2007
Posted:
269 messages

500 DS

Post Sun Apr 01, 2007 1:12 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....


    Is x - y > r - s?
    (1) x > r and y < s?
    (2) y = 2, s = 3, r = 5, and x = 6.

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    Prasanna Master | Next Rank: 500 Posts
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    Post Sun Apr 01, 2007 5:10 pm
    dunkin77 wrote:
    Hi,

    The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....


    Is x - y > r - s?
    (1) x > r and y < s?
    (2) y = 2, s = 3, r = 5, and x = 6.
    --------------------------------------------------------------------

    Hi

    I tried substituting both positive and negative for the variables. I observe that (1) is sufficient to answer the question. Some of the values I considered

    10-(-20)> 9-(-19)

    -10-(20)>-11-(21)

    -10-(-20)>-11-(-19)

    Think the answer should be D. Did you come across any set of values for which it fails?

    Prasanna

    gabriel Legendary Member
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    Post Mon Apr 02, 2007 4:00 am
    dunkin77 wrote:
    Hi,

    The answer is D but I thought the answer was B because 1) dose not say if Y and S are positive....


    Is x - y > r - s?
    (1) x > r and y < s?
    (2) y = 2, s = 3, r = 5, and x = 6.
    remember this rule.... if a(1)>a(2) and a(3) > a(4) ...... then a(1) + a(3)>a(2)+a(4)....


    applying this rule to the first statement ... x>r and s>y... so x+s>y+r ... so x-y>r-s ... so A is sufficient...

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