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if a and b are integers and a is even , what is the value of

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Senior Manager
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if a and b are integers and a is even , what is the value of [#permalink] New post 29 Jan 2007, 19:04
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B
C
D
E

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if a and b are integers and a is even , what is the value of a-b?

(1) a < 3
(2) a/b = 2/7
Intern
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Joined: 09 Oct 2006
Posts: 15
Location: Los Angeles, CA
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Kudos [?]: 5 [0], given: 0

 [#permalink] New post 29 Jan 2007, 19:57
Getting E.

1) a < 3 ... This is insufficient since we don't know anything about b.

2) This could be seen as a ratio. if a = 2 and b = 7, then 2 - 7 = -5. However, a could = 4 and b could = 14, which makes 4 - 14 = -10.

Together it is still insufficient.

If a = 2 or -2, plugging it into the equation that satisfies the ratio produces different results.

OA?
Senior Manager
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 [#permalink] New post 30 Jan 2007, 05:33
thanks Acoustic

OA = E ( i was not counting negative even numbers)
SVP
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Kudos [?]: 78 [0], given: 39

 [#permalink] New post 30 Jan 2007, 06:25
if a and b are integers and a is even , what is the value of a-b?

(1) a < 3
(2) a/b = 2/7

from one

a could be 0 or 2 ......insuff
from two

a/b is a ratio of 2:7 ie: on the same scale a = 2x and b = 7x

both together

a cant = zero or the ratio given in second statment is not valid

thus a = 2 and a-b = -5

my answer is thus C

I DONT THINK GMAT DEALS WITH SIGNS WHEN IT COMES TO EVEN AND ODD.

IF SOMEONE CAN CLARIFY THIS I LL BE MUCH OBLIGED
Senior Manager
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 [#permalink] New post 30 Jan 2007, 06:36
According to OG {...-4, -2, 0, 2, 4...} is a set of even integers

I think, -ve even should be considreed
  [#permalink] 30 Jan 2007, 06:36
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