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# Is x less than 20? 1) The sum of x and y is less than 20 2)

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Manager
Joined: 17 Aug 2006
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Is x less than 20? 1) The sum of x and y is less than 20 2) [#permalink]  09 Aug 2007, 11:08
Is x less than 20?

1) The sum of x and y is less than 20

2) y is less than 20

I thought working together they would be sufficient but they are not.[/quote]
Director
Joined: 12 Jul 2007
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1. x + y < 20

x could be 25 and y could be -6. so insufficient

2. y < 20

again, x could be 25 and y could be -6. so insufficient

now it could be C if they said the numbers were all positive integers, but they don't say that.
Director
Joined: 03 May 2007
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Schools: University of Chicago, Wharton School
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Re: GMAT PREP 6 [#permalink]  10 Aug 2007, 15:25
nfa1rhp wrote:
Is x less than 20?

1) The sum of x and y is less than 20

2) y is less than 20

I thought working together they would be sufficient but they are not.
[/quote]

E. could be tempting but is not correct...
Manager
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Re: GMAT PREP 6 [#permalink]  10 Aug 2007, 16:01
Fistail wrote:
nfa1rhp wrote:
Is x less than 20?

1) The sum of x and y is less than 20

2) y is less than 20

I thought working together they would be sufficient but they are not.

E. could be tempting but is not correct...[/quote]

How could E possibly not be correct?
Director
Joined: 03 May 2007
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Schools: University of Chicago, Wharton School
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Re: GMAT PREP 6 [#permalink]  10 Aug 2007, 18:04
Robin in NC wrote:
Fistail wrote:
nfa1rhp wrote:
Is x less than 20?

1) The sum of x and y is less than 20

2) y is less than 20

I thought working together they would be sufficient but they are not.

E. could be tempting but is not correct...

How could E possibly not be correct?

E. C could be tempting but is not correct...
SVP
Joined: 05 Jul 2006
Posts: 1554
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Is x less than 20?

1) The sum of x and y is less than 20

2) y is less than 20

obviously each alone is not suff

1) x+y<20
2) y<20

together

x+2y<40

x<40 - 2y

STILL Y COULD BE +VE OR -VE

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