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14 Apr 2006, 13:42
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Jonna bough $0.15 stamps and $0.29 stamps. How many stamps of $0.15 did she buy?
A She bought $4.40 worth of stamps
B she bought an equal number $0.15 and $0.29 stamps
A She bought $4.40 worth of stamps
B she bought an equal number $0.15 and $0.29 stamps
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14 Apr 2006, 14:02
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Jonna bough $0.15 stamps and $0.29 stamps. How many stamps of $0.15 did she buy?
A She bought $4.40 worth of stamps
B she bought an equal number $0.15 and $0.29 stamps
Statement 1: She bought 4.40 worth of stamps. Because we have an odd number for .29, and an even number spent on the stamps, and there is no way for any addition of .15 stamps to "even" us out, we should look first at how many .29 stamps we'd need to buy to get an even number. This would only happen at multiples of 10. If we buy 10 .29 stamps, we get 2.90; if we buy 20 .29 stamps, we get 5.80, which is too much. Therefore, she bought 10 .29 stamps for 2.90 and 10 .15 for 1.50 -- this equals 4.40.
Statement 2 is insufficient: we don't know how much of either stamp she bought.
Answer is A.
A She bought $4.40 worth of stamps
B she bought an equal number $0.15 and $0.29 stamps
Statement 1: She bought 4.40 worth of stamps. Because we have an odd number for .29, and an even number spent on the stamps, and there is no way for any addition of .15 stamps to "even" us out, we should look first at how many .29 stamps we'd need to buy to get an even number. This would only happen at multiples of 10. If we buy 10 .29 stamps, we get 2.90; if we buy 20 .29 stamps, we get 5.80, which is too much. Therefore, she bought 10 .29 stamps for 2.90 and 10 .15 for 1.50 -- this equals 4.40.
Statement 2 is insufficient: we don't know how much of either stamp she bought.
Answer is A.
