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The number of stamps

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Manager
Manager
Joined: 24 Jun 2009
Posts: 61
Followers: 1

Kudos [?]: 6 [0], given: 2

The number of stamps [#permalink] New post 20 Jan 2010, 17:12
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (01:09) correct 0% (00:00) wrong based on 1 sessions
Not sure where I'm going wrong. Here is what I have so far:

[5x-10]/[3x+10] = 7/5
x = 5

That doesn't fit so I need some help here!

Image
1 KUDOS received
Senior Manager
Senior Manager
Joined: 30 Aug 2009
Posts: 293
Location: India
Concentration: General Management
Followers: 2

Kudos [?]: 82 [1] , given: 5

GMAT Tests User
Re: The number of stamps [#permalink] New post 20 Jan 2010, 17:57
1
This post received
KUDOS
shanewyatt wrote:
Not sure where I'm going wrong. Here is what I have so far:

[5x-10]/[3x+10] = 7/5
x = 5

That doesn't fit so I need some help here!

Image


the equation formed is correct
[5x-10]/[3x+10] = 7/5
25x - 50 = 21x + 70 ==> 4x = 120 => x = 30

Kaye had 150 and Alberto had 90 before exchange. after the exchange Kaye had 140 and Alberto had 100
so Kaye had 140 -100 = 40 more stamps - answer C
Manager
Manager
Joined: 10 Feb 2010
Posts: 196
Followers: 2

Kudos [?]: 29 [0], given: 6

GMAT Tests User
Re: The number of stamps [#permalink] New post 12 Feb 2010, 20:27
40.

Same explanation --
5x-10/3x=10 = 7/5
Solving x=30
Kaye - Alb = 5x-10 - (3x+10) = 2x-20 = 40
Re: The number of stamps   [#permalink] 12 Feb 2010, 20:27
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The number of stamps

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