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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
Joined: 19 Jul 2006
Posts: 358

Kudos [?]: 8 [0], given: 0

if a and b are integers and a is even , what is the value of [#permalink]

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29 Jan 2007, 20:04
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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

Kudos [?]: 8 [0], given: 0

Intern
Joined: 09 Oct 2006
Posts: 15

Kudos [?]: 13 [0], given: 0

Location: Los Angeles, CA

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29 Jan 2007, 20:57
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?

Kudos [?]: 13 [0], given: 0

Senior Manager
Joined: 19 Jul 2006
Posts: 358

Kudos [?]: 8 [0], given: 0

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30 Jan 2007, 06:33
thanks Acoustic

OA = E ( i was not counting negative even numbers)

Kudos [?]: 8 [0], given: 0

SVP
Joined: 05 Jul 2006
Posts: 1750

Kudos [?]: 430 [0], given: 49

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30 Jan 2007, 07:25
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

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

IF SOMEONE CAN CLARIFY THIS I LL BE MUCH OBLIGED

Kudos [?]: 430 [0], given: 49

Senior Manager
Joined: 24 Oct 2006
Posts: 339

Kudos [?]: 34 [0], given: 0

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30 Jan 2007, 07:36
According to OG {...-4, -2, 0, 2, 4...} is a set of even integers

I think, -ve even should be considreed

Kudos [?]: 34 [0], given: 0

30 Jan 2007, 07:36
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