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# stamps

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Intern
Joined: 17 Oct 2008
Posts: 3

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17 Oct 2008, 10:20
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Joanna bought only \$0.15 stamps and \$0.29 stamps. How many \$0.15 stamps did she buy?
(1) She bought \$4.40 worth of stamps.
(2) She bought an equal number of \$0.15 stamps and \$0.29 stamps.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

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Posts: 1741

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17 Oct 2008, 10:30
[quote="amychen77"]Joanna bought only \$0.15 stamps and \$0.29 stamps. How many \$0.15 stamps did she buy?
(1) She bought \$4.40 worth of stamps.
(2) She bought an equal number of \$0.15 stamps and \$0.29 stamps.

0.15x+0.29y = 4.40

15x+29y= 440

29*10 =290, 15*10 = 150 thus x = 10.....suff

from 2
insuff

A

Last edited by yezz on 17 Oct 2008, 11:57, edited 2 times in total.
VP
Joined: 30 Jun 2008
Posts: 1018

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19 Oct 2008, 07:55
yezz wrote:
amychen77 wrote:
Joanna bought only \$0.15 stamps and \$0.29 stamps. How many \$0.15 stamps did she buy?
(1) She bought \$4.40 worth of stamps.
(2) She bought an equal number of \$0.15 stamps and \$0.29 stamps.

0.15x+0.29y = 4.40

15x+29y= 440

29*10 =290, 15*10 = 150 thus x = 10.....suff

from 2
insuff

A

is there a faster method ?? What if it doesn't strike during the exam that 10 and 10 would suffice ?? Is this trial and error ??
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Retired Moderator
Joined: 05 Jul 2006
Posts: 1741

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19 Oct 2008, 08:05
1
KUDOS
amitdgr wrote:
yezz wrote:
amychen77 wrote:
Joanna bought only \$0.15 stamps and \$0.29 stamps. How many \$0.15 stamps did she buy?
(1) She bought \$4.40 worth of stamps.
(2) She bought an equal number of \$0.15 stamps and \$0.29 stamps.

0.15x+0.29y = 4.40

15x+29y= 440

29*10 =290, 15*10 = 150 thus x = 10.....suff

from 2
insuff

A

is there a faster method ?? What if it doesn't strike during the exam that 10 and 10 would suffice ?? Is this trial and error ??

it is instinct and educated guess

15x+29y= 440

440 has to be discounted y times of 29's untill the residual amount is devisible by 15.
or

for a multiple of 29 when added to a multiple of 15 to give a sum with a units digit 0

the 29 has to be multiplied by 5 or 10.
VP
Joined: 30 Jun 2008
Posts: 1018

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19 Oct 2008, 08:50
yezz wrote:

it is instinct and educated guess

15x+29y= 440

440 has to be discounted y times of 29's untill the residual amount is devisible by 15.
or

for a multiple of 29 when added to a multiple of 15 to give a sum with a units digit 0

the 29 has to be multiplied by 5 or 10.

Thanks for the tip Yezz +1 for you
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Retired Moderator
Joined: 05 Jul 2006
Posts: 1741

### Show Tags

19 Oct 2008, 09:14
amitdgr wrote:
yezz wrote:

it is instinct and educated guess

15x+29y= 440

440 has to be discounted y times of 29's untill the residual amount is devisible by 15.
or

for a multiple of 29 when added to a multiple of 15 to give a sum with a units digit 0

the 29 has to be multiplied by 5 or 10.

Thanks for the tip Yezz +1 for you

you are wellcomed anytime..we are all here to learn arent we? i like your questions very much and i beleive w e think on the same wave lenght
VP
Joined: 30 Jun 2008
Posts: 1018

### Show Tags

19 Oct 2008, 10:41
yezz wrote:
amitdgr wrote:
yezz wrote:

it is instinct and educated guess

15x+29y= 440

440 has to be discounted y times of 29's untill the residual amount is devisible by 15.
or

for a multiple of 29 when added to a multiple of 15 to give a sum with a units digit 0

the 29 has to be multiplied by 5 or 10.

Thanks for the tip Yezz +1 for you

you are wellcomed anytime..we are all here to learn arent we? i like your questions very much and i beleive w e think on the same wave lenght

Thanks Yezz I take it as a compliment :D .... And yes we are all here to learn from each other
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Retired Moderator
Joined: 05 Jul 2006
Posts: 1741

### Show Tags

19 Oct 2008, 13:31
:wink:

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: stamps   [#permalink] 19 Oct 2008, 13:31
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