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# The number of stamps

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Manager
Joined: 24 Jun 2009
Posts: 60
Followers: 2

Kudos [?]: 72 [0], given: 2

The number of stamps [#permalink]

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20 Jan 2010, 17:12
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:09) correct 0% (00:00) wrong based on 2 sessions

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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!

Senior Manager
Joined: 30 Aug 2009
Posts: 286
Location: India
Concentration: General Management
Followers: 3

Kudos [?]: 162 [1] , given: 5

Re: The number of stamps [#permalink]

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20 Jan 2010, 17:57
1
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!

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
Joined: 10 Feb 2010
Posts: 193
Followers: 2

Kudos [?]: 106 [0], given: 6

Re: The number of stamps [#permalink]

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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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