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

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VP
Joined: 26 Apr 2004
Posts: 1225
Location: Taiwan
Followers: 2

Kudos [?]: 167 [0], given: 0

Joanna bought only $0.15 stamps and$0.29 stamps. How many [#permalink]  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
Senior Manager
Joined: 25 Dec 2003
Posts: 360
Location: India
Followers: 1

Kudos [?]: 17 [0], given: 0

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

Giving another SHOT

VP
Joined: 26 Apr 2004
Posts: 1225
Location: Taiwan
Followers: 2

Kudos [?]: 167 [0], given: 0

carsen wrote:

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?
Senior Manager
Joined: 25 Jul 2004
Posts: 274
Followers: 1

Kudos [?]: 7 [0], given: 0

Re: PS--tricky [#permalink]  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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