X, Y, Z all is the positive number, X/Y> (X+Z) / (Y+Z) ? : DS Archive
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# X, Y, Z all is the positive number, X/Y> (X+Z) / (Y+Z) ?

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CEO
Joined: 15 Aug 2003
Posts: 3460
Followers: 67

Kudos [?]: 862 [0], given: 781

X, Y, Z all is the positive number, X/Y> (X+Z) / (Y+Z) ? [#permalink]

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13 Sep 2003, 04:21
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X, Y, Z all is the positive number, X/Y> (X+Z) / (Y+Z) ?
1) X>Z
2) X>Y
SVP
Joined: 03 Feb 2003
Posts: 1603
Followers: 8

Kudos [?]: 245 [0], given: 0

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13 Sep 2003, 04:48
pick numbers?

(1) x>z, y is any positive

x=3, y=2, z=1 ==> 3/2>4/3 true
x=3, y=10, z=1 ==> 3/10> 4/11 wrong, not enough

(2) x>y, z is any positive

seems enough

vote for B.
CEO
Joined: 15 Aug 2003
Posts: 3460
Followers: 67

Kudos [?]: 862 [0], given: 781

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13 Sep 2003, 04:51
stolyar wrote:
pick numbers?

(1) x>z, y is any positive

x=3, y=2, z=1 ==> 3/2>4/3 true
x=3, y=10, z=1 ==> 3/10> 4/11 wrong, not enough

(2) x>y, z is any positive

seems enough

vote for B.

Correct!
uh..dont know how i missed that z is positive...

thanks
praetorian
13 Sep 2003, 04:51
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