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# Gmat prep

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Manager
Joined: 19 Sep 2005
Posts: 110

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06 Nov 2005, 21:46
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is x+y < 1?

1. x <8/9
2. y< 1/8

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VP
Joined: 06 Jun 2004
Posts: 1050

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Location: CA

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06 Nov 2005, 23:29
Jennif102 wrote:
Is x+y < 1?

1. x <8/9
2. y< 1/8

(1) We do not know the value of y. Insufficient.
(2) We do not know the value of x. Insufficient.

Together, x < (64/72), y < (9/72). Choosing values smaller than these results in x+y < 1. Sufficient.

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Manager
Joined: 15 Aug 2005
Posts: 198

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Location: New York

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06 Nov 2005, 23:38
TeHCM wrote:
Jennif102 wrote:
Is x+y < 1?

1. x <8/9
2. y< 1/8

(1) We do not know the value of y. Insufficient.
(2) We do not know the value of x. Insufficient.

Together, x < (64/72), y < (9/72). Choosing values smaller than these results in x+y < 1. Sufficient.

But what about when X=63.5/72 and Y=8.5/72, then X+Y =1

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VP
Joined: 22 Aug 2005
Posts: 1111

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Location: CA

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06 Nov 2005, 23:39
TeHCM wrote:
(1) We do not know the value of y. Insufficient.
(2) We do not know the value of x. Insufficient.

Together, x < (64/72), y < (9/72). Choosing values smaller than these results in x+y < 1. Sufficient.

x < 8/9 = 0.88888 ...repeated decimal
y < 1/8 = 0.125

i don't know if it is valid but if we take:

x = 0.12 < 0.125
y = 0.88 < 0.888888

x+y = 1.00

in this case ans will be E.

however as i said, i am not sure about bold part

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VP
Joined: 06 Jun 2004
Posts: 1050

Kudos [?]: 185 [0], given: 0

Location: CA

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06 Nov 2005, 23:40
duttsit wrote:
TeHCM wrote:
(1) We do not know the value of y. Insufficient.
(2) We do not know the value of x. Insufficient.

Together, x < (64/72), y < (9/72). Choosing values smaller than these results in x+y < 1. Sufficient.

x < 8/9 = 0.88888 ...repeated decimal
y < 1/8 = 0.125

i don't know if it is valid but if we take:

x = 0.12 < 0.125
y = 0.88 < 0.888888

x+y = 1.00

in this case ans will be E.

however as i said, i am not sure about bold part

Good point guys! I knew there was something fishy about the way I did this problem. My thought process is not complete...............Oy.

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VP
Joined: 30 Sep 2004
Posts: 1480

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Location: Germany

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07 Nov 2005, 02:58
E)...1) or 2) is obv.insuff...1) and 2) x<8/9 and y<1/8 means x+y<73/72...hence insuff...
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

Kudos [?]: 426 [0], given: 0

07 Nov 2005, 02:58
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