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Jennif102
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Gmat prep 06 Nov 2005, 21:46
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Is x+y < 1?

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

Please explain. thx



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TeHCM
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Gmat prep 06 Nov 2005, 23:29
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Jennif102
Is x+y < 1?

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

Please explain. thx
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(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
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celiaXDN
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Gmat prep 06 Nov 2005, 23:38
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TeHCM
Jennif102
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
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But what about when X=63.5/72 and Y=8.5/72, then X+Y =1
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duttsit
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Gmat prep 06 Nov 2005, 23:39
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TeHCM

(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
Show more


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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TeHCM
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Gmat prep 06 Nov 2005, 23:40
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duttsit
TeHCM

(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
Show more


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



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!