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stamps [#permalink] New post 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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Re: stamps [#permalink] New post 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
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A

Last edited by yezz on 17 Oct 2008, 11:57, edited 2 times in total.
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Re: stamps [#permalink] New post 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 ??
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Re: stamps [#permalink] New post 19 Oct 2008, 08:05
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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.
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Re: stamps [#permalink] New post 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
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Re: stamps [#permalink] New post 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 :)
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Re: stamps [#permalink] New post 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 :)
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Re: stamps [#permalink] New post 19 Oct 2008, 13:31
:lol: :wink:
Re: stamps   [#permalink] 19 Oct 2008, 13:31
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