Joanna bought only $0.15 stamps and$0.29 stamps. How many : DS Archive
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# Joanna bought only $0.15 stamps and$0.29 stamps. How many

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Joanna bought only $0.15 stamps and$0.29 stamps. How many [#permalink]

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15 Sep 2007, 14:45
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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.
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Re: DS : Set 6, Q30 - Joanna and her stamps [#permalink]

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15 Sep 2007, 15:00
gluon 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.

it is combined 1 and 2.

she bought equal number of stamps so it can be denoted by x
.15x+.29x=4.40
.44x=4.4
x=10

so she bought 10 of .15 and 10 of .29
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15 Sep 2007, 18:38
Isn't (1) by itself sufficient to answer the question ? The only positive integer values of x and y that satifsy 0.15x+0.29y=4.40 are x=y=10.
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15 Sep 2007, 23:26
coldweather999 wrote:
Isn't (1) by itself sufficient to answer the question ? The only positive integer values of x and y that satifsy 0.15x+0.29y=4.40 are x=y=10.

Hey coolwaether999.. you are cool (right). Only 1 combination works that way.. So A is alone suff. How do you figure out these kind of solution ? I am sure, trial and error will consume lot of time ... do you just hear your ear on that ..?

But the OA that I have says the the correct ans as D. I am just not able to figure out how B alone suff..
can anyone shed some light..
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Re: DS : Set 6, Q30 - Joanna and her stamps [#permalink]

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16 Sep 2007, 00:33
gluon 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.

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