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Doris and Edward both collect stamps. If Doris gives Edward

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Doris and Edward both collect stamps. If Doris gives Edward [#permalink] New post   11 Jul 2019, 06:11
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Doris and Edward both collect stamps. If Doris gives Edward 72 stamps, then Doris will have 4 times the number of stamps that Edward has. If Doris gives Edward 129 stamps, then Doris will have 3 times the number of stamps that Edward has. How many more stamps than Edward does Doris now have?

A. 156

B. 387

C. 672

D. 750

E. 828
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Re: Doris and Edward both collect stamps. If Doris gives Edward [#permalink] New post   12 Jul 2019, 00:04
1
Carcass wrote:
Doris and Edward both collect stamps. If Doris gives Edward 72 stamps, then Doris will have 4 times the number of stamps that Edward has. If Doris gives Edward 129 stamps, then Doris will have 3 times the number of stamps that Edward has. How many more stamps than Edward does Doris now have?

A. 156

B. 387

C. 672

D. 750

E. 828



Here,
For the first statement it can be written as,

\(D - 72 = 4 (E + 72)\)

\(D - 72 = 4E + 288\)

\(D = 4E + 360\) -------------I


For the 2nd statement

\(D -129 = 3 (E + 129)\)

\(D = 3E + 516\)------------------II

From I & II,

\(4E + 360 = 3E + 516\)

\(E = 156\)


Doris now have

\(D = (4 * 156) + 360 = 984\) stamps

Therefore,
Doris have = \(984 - 156 = 828\) more stamps than Edward now.
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Re: Doris and Edward both collect stamps. If Doris gives Edward [#permalink] New post   17 Mar 2023, 08:56
Hi, I perfectly understand the solution, but i have a problem with the language.
Before I look the answer provided below, I make an assumption that "the number of stamps that Edward has" means the number of stamps that Edward has BEFORE doris gave him stamps. D-72=4(E)
Could you explain what's the phrase/grammar used in this question that lead us to take "the number of stamps that Edward has AFTER doris gave him stamps." ?
D-72=4(E+72)


Carcass wrote:
Doris and Edward both collect stamps. If Doris gives Edward 72 stamps, then Doris will have 4 times the number of stamps that Edward has. If Doris gives Edward 129 stamps, then Doris will have 3 times the number of stamps that Edward has. How many more stamps than Edward does Doris now have?

A. 156

B. 387

C. 672

D. 750

E. 828
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Doris and Edward both collect stamps. If Doris gives Edward [#permalink] New post   17 Mar 2023, 09:55
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step by step

Doris and Edward both collect stamps.

Ok they have stamps

If Doris gives Edward 72 stamps,


Doris gifted Edward of 72 of them

then Doris will have 4 times the number of stamps that Edward has.

Edward has x stamps and Doris 4x

If Doris gives Edward 129 stamps,

Doris cedes 129 stamps to Edward

then Doris will have 3 times the number of stamps that Edward has.


In the time laps is easy to understand that NOW Edward has a certain number of stamps NOT BEFORE

How many more stamps than Edward does Doris now have?
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Re: Doris and Edward both collect stamps. If Doris gives Edward [#permalink] New post   17 Apr 2024, 15:39
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Doris and Edward both collect stamps. If Doris gives Edward [#permalink]
17 Apr 2024, 15:39
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