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Joanna bought only \$0.15 stamps and \$0.29 stamps. How many

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Manager
Joined: 14 Jan 2006
Posts: 87
Schools: HKUST
Joanna bought only \$0.15 stamps and \$0.29 stamps. How many [#permalink]

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23 Sep 2008, 14:04
Joanna bought only \$0.15 stamps and \$0.29 stamps. How many \$0.15 stamps did she
(1) She bought \$4.40 worth of stamps.
(2) She bought an equal number of \$0.15 stamps and \$0.29 stamps.

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Director
Joined: 27 Jun 2008
Posts: 526
WE 1: Investment Banking - 6yrs
Re: GMAT SET 19 - 7 [#permalink]

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23 Sep 2008, 14:15
0.15 = x
0.29 = y

x+y = s, what is x?

(1) s=4.40 insuff
(2) x=y, dont know "how many" insuff

(1 & 2)
x+y = 4.40, x=y
eg, 10 >> 10*0.15 + 10*0.29 = 4.40

C
Director
Joined: 23 May 2008
Posts: 757
Re: GMAT SET 19 - 7 [#permalink]

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23 Sep 2008, 15:16
1)4.40 = .15x + .29y insuff.

2)x=y insuff

together

.15x/.15x +.29x = s/4.40
.15/.44 = s/4.40
s=1.50, so 10 stamps for .15 cents and 10 stamps for 29 cents
SVP
Joined: 17 Jun 2008
Posts: 1504
Re: GMAT SET 19 - 7 [#permalink]

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25 Sep 2008, 12:53
A should be sufficient.

stmt1 says that 15x + 29y = 440 or x = (440-29y)/15

This equation is true for only positive integers of x = 10 and y = 10. Hence, should be sufficient.
Current Student
Joined: 28 Dec 2004
Posts: 3311
Location: New York City
Schools: Wharton'11 HBS'12
Re: GMAT SET 19 - 7 [#permalink]

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25 Sep 2008, 13:38
i too agree with A..

we know that .15x+.29y=4.4

since we can only have x and y as integers..we know that they bought 10 of each..

sufficient

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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!

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Re: GMAT SET 19 - 7   [#permalink] 25 Sep 2008, 13:38
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Joanna bought only \$0.15 stamps and \$0.29 stamps. How many

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