C positive?

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grandh01: Master | Next Rank: 500 Posts; Posts: 265; Joined: Tue Jul 03, 2012 11:04 pmFollowed by: 6 members

by grandh01 » Mon Sep 10, 2012 8:36 pm

If a is to b is to c, is c positive?

1) c=2a
2) b^2=32

OA IS E

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Source: Beat The GMAT — Data Sufficiency | Mon Sep 10, 2012 8:36 pm

everything's eventual: Master | Next Rank: 500 Posts; Posts: 101; Joined: Sun Jun 03, 2012 10:10 pmFollowed by: 1 member; Thanked: 10 times

by everything's eventual » Mon Sep 10, 2012 8:46 pm

a : b : c,therefore b^2 = ac

1) c = 2a

c is +ve when a is +ve and c is -ve when a is -ve. So we cannot say whether c is +ve or -ve.

2) b ^2 = 32

Therefore ac = 32.

From above we just know that a and c have the same sign. Both can be +ve or both can be -ve. So we still cannot say for sure whether c is +ve or -ve.

Take both statement together and the only thing we know that a and c have the same sign. But we do not know whether these are +ve or -ve.

So both together are also insufficient.

Choose E.

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vk_vinayak: Legendary Member; Posts: 502; Joined: Tue Jun 03, 2008 11:36 pmFollowed by: 21 members; Thanked: 99 times

by vk_vinayak » Tue Sep 11, 2012 12:38 am

grandh01 wrote:If a is to b is to c, is c positive?

1) c=2a
2) b^2=32

OA IS E

Is it a complete question? a

c = ?

- VK

I will (Learn. Recognize. Apply)

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