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

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05 Feb 2005, 20:14

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A

B

C

D

E

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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.

Can you explain how you know that y can only be 10? I was learning towards that answer but wasn't sure how to tell if there'd be any other values taht would leave integers for both variables.

I agree A is sufficient but it means you have to make all the calculation to be sure there is no other match between the 2 kind of stamps to reach 4.40 It seems quite a long way to me. There might be a shortcut...i think the shortest way might be the one explained by Mantha

DLMD, I am sorry but I dont see how D could be the OA. There is no way to find the solution with only statement B. It could be 2, 3, 15, 100 or any other number of stamps because the only information you have is that you have the same number of stamps for each category...

I don't see how statement 2 by itself is sufficient. All you know that that statement is that there are the same number of .15 stamps as .29. Couldn't that number be anything? For example, there could be one .15 and one .29 or there could be a million .15 and a million .29.

I agree A is sufficient but it means you have to make all the calculation to be sure there is no other match between the 2 kind of stamps to reach 4.40 It seems quite a long way to me. There might be a shortcut...i think the shortest way might be the one explained by Mantha

DLMD, I am sorry but I dont see how D could be the OA. There is no way to find the solution with only statement B. It could be 2, 3, 15, 100 or any other number of stamps because the only information you have is that you have the same number of stamps for each category...

Antmavel, you are right, there is no way to get the answer just from statement 2.