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If a + b - c = d, and if a - b + c = e, then a =

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Intern
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Joined: 14 Sep 2011
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If a + b - c = d, and if a - b + c = e, then a = [#permalink] New post 21 Sep 2011, 12:23
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

90% (01:23) correct 10% (00:20) wrong based on 20 sessions
If a + b - c = d, and if a - b + c = e, then a =

A. 2(d + e)

B. d – e

C. (d + e)/2

D. d-2e

E. e-d


Any input/help would be appreciated.

Cheers!
[Reveal] Spoiler: OA
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Re: Problem [#permalink] New post 21 Sep 2011, 12:27
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gl0wstix wrote:
Hi, I have a problem I'm not sure of the best way to attack algebraically:

If a + b - c = d, and if a - b + c = e, then a =

A. 2(d + e)

B. d – e

C. (d + e)/2

D. d-2e

E. e-d

Any input/help would be appreciated.

Cheers!


Add both equations:
a + b - c = d
a - b + c = e

a+b-c+a-b+c=d+e
2a=d+e
a=(d+e)/2

Ans: "C"
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1 KUDOS received
Intern
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Status: Need to read faster and get less distracted by the ticking clock!
Affiliations: Golden Key
Joined: 19 Nov 2010
Posts: 21
Location: Toronto, ON
Schools: INSEAD, ISB, NUS
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Kudos [?]: 9 [1] , given: 4

Re: Algebra Problem [#permalink] New post 21 Sep 2011, 12:46
1
This post received
KUDOS
gl0wstix wrote:
Hi, I have a problem I'm not sure of the best way to attack algebraically:

If a + b - c = d, and if a - b + c = e, then a =

A. 2(d + e)

B. d – e

C. (d + e)/2

D. d-2e

E. e-d


Any input/help would be appreciated.

Cheers!



Add both the equations and solve.

therefore 2a = d+e
a = (d+e)/2
Manager
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Status: Essaying
Joined: 27 May 2010
Posts: 154
Location: Ghana
Concentration: Finance, Finance
Schools: Cambridge
GMAT 1: 690 Q47 V37
GPA: 3.9
WE: Accounting (Education)
Followers: 1

Kudos [?]: 9 [0], given: 8

GMAT ToolKit User
Re: Problem [#permalink] New post 22 Sep 2011, 03:37
Add equ 1 and 2 .....
Re: Problem   [#permalink] 22 Sep 2011, 03:37
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If a + b - c = d, and if a - b + c = e, then a =

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