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Manager
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Gmat prep [#permalink] New post 06 Nov 2005, 20:46
Is x+y < 1?

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

Please explain. thx
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Re: Gmat prep [#permalink] New post 06 Nov 2005, 22:29
Jennif102 wrote:
Is x+y < 1?

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

Please explain. thx


(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.

My answer is C
Manager
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Re: Gmat prep [#permalink] New post 06 Nov 2005, 22:38
TeHCM wrote:
Jennif102 wrote:
Is x+y < 1?

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

Please explain. thx


(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.

My answer is C


But what about when X=63.5/72 and Y=8.5/72, then X+Y =1
VP
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Re: Gmat prep [#permalink] New post 06 Nov 2005, 22:39
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.

My answer is C


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
VP
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Re: Gmat prep [#permalink] New post 06 Nov 2005, 22:40
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.

My answer is C


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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 [#permalink] New post 07 Nov 2005, 01:58
E)...1) or 2) is obv.insuff...1) and 2) x<8/9 and y<1/8 means x+y<73/72...hence insuff...
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If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

  [#permalink] 07 Nov 2005, 01:58
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