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Alice's take home pay, confusing words...

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Alice's take home pay, confusing words... [#permalink] New post 20 Dec 2009, 05:58
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50% (01:15) correct 50% (02:41) wrong based on 15 sessions
I found the word problem little confusing. Please analyze.

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[Reveal] Spoiler:
D

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Re: Alice's take home pay, confusing words... [#permalink] New post 20 Dec 2009, 06:54
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let monthly income is x; saving is y; expenditure is x-y

eqn 12y=3(x-y)
solving y=x/5
hence 1/5 i.e D
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Re: Alice's take home pay, confusing words... [#permalink] New post 20 Dec 2009, 22:17
xcusemeplz2009 wrote:
let monthly income is x; saving is y; expenditure is x-y

eqn 12y=3(x-y)
solving y=x/5
hence 1/5 i.e D


wow! never thought that it cud be so easy
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Re: Alice's take home pay, confusing words... [#permalink] New post 21 Dec 2009, 12:50
Same approach got 1/5.
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Re: Alice's take home pay, confusing words... [#permalink] New post 21 Dec 2009, 15:14
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Answer 1/5.
Saving: x
Income: p
Non saved p-x

12x=3(p-x)
15x=3p
x=p/5
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Re: Alice's take home pay, confusing words... [#permalink] New post 18 Apr 2011, 11:31
Alice's take-home pay last year was the same each month, and she saved the same fraction of her take home pay each month. The total amount she had saved at the end of the year was three times the amount of that portion of her monthly take home pay that she did NOT save. If all the money that she saved last year was from her take-home pay, what fraction of her take home pay did she save each month?

Is it problem if I don't assume monthly payment [as saving is said in fraction so payment is one]
such as:
saving is x fraction
so, total saving of the year 12x
according to the condition 12x = 3(1-x)
12x = 3-3x
12x+3x= 3
15x = 3
x = 3/15 = 1/5 or D ans.
Please help if i did wrong.
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Last edited by Baten80 on 01 May 2011, 03:10, edited 1 time in total.
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Re: Alice's take home pay, confusing words... [#permalink] New post 18 Apr 2011, 11:34
Baten80 wrote:
Is it problem if I don't assume monthly payment [as saving is said in fraction so payment is one]
such as:
saving is x fraction
so, total saving of the year 12x
according to the condition 12x = 3(1-x)
12x = 3-3x
12x+3x= 3
15x = 3
x = 3/15 = 1/5 or D ans.
Please help if i did wrong.


Your solution is correct.
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Re: Alice's take home pay, confusing words... [#permalink] New post 18 Apr 2011, 11:53
became cool. Thank u fluke.
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100 GMAT PREP Quantitative collection http://gmatclub.com/forum/gmat-prep-problem-collections-114358.html
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Re: Alice's take home pay, confusing words... [#permalink] New post 18 Apr 2011, 18:13
Let x = take home pay each month

Let y = Part of x saved each month

So y/x = constant

Part of monthly income not saved = x(1 - y/x)


So y/x = ?

12 * y/x * x = 3 * x(1 - y/x)

12y = 3x - 3y

=> 15y = 3x => y/x = 1/5

Answer - D
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Re: Alice's take home pay, confusing words...   [#permalink] 18 Apr 2011, 18:13
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