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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] New post 17 Aug 2004, 07:27
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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.

the answer is (D), but I think (1) is a little tough.

Does that mean we must try all mutiples of 0.29 (from 1 to 15), and then find out only 10 satisfy ?

thank you
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 [#permalink] New post 17 Aug 2004, 07:33
The answer D is wrong. The correct answer is A.

From B we cannot find any information. I presume the OA is wrong.
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 [#permalink] New post 17 Aug 2004, 07:37
carsen wrote:
The answer D is wrong. The correct answer is A.

From B we cannot find any information. I presume the OA is wrong.



carsen, you are right. The OA is (A).

Do you have any faster method?
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Re: PS--tricky [#permalink] New post 17 Aug 2004, 13:00
chunjuwu 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.

the answer is (D), but I think (1) is a little tough.

Does that mean we must try all mutiples of 0.29 (from 1 to 15), and then find out only 10 satisfy ?

thank you



You need to factor in a bit of observation. You only need to check 4 multiples of the second quantity of stamps, because no other multiple would allow you to have a total quantity ending in 0 cents.
0 (doesn't work, .15 doesn't divide 4.40)
5 (doesn't work)
10 (works)
15 (doesn't work)
Re: PS--tricky   [#permalink] 17 Aug 2004, 13:00
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