Problem:
Juan organizes the stamps in his collection by country and by the decade in which they were issued. The prices he paid for them at a stamp shop were: Brazil and France, 6¢ each, Peru 4¢ each, and Spain 5¢ each. (Brazil and Peru are South Americal countries and France and Spain are in Europe.)
Number of Stamps by DecadeCountryBrazilFrancePeruSpain’50s4863’60s7449’70s1212613’80s815109Juan’s Stamp Collection
How many of his European stamps were issued in the ′80s?
Answer Choices:
A. 9
B. 15
C. 18
D. 24
E. 42
Solution:
There are 15 French stamps and 9 Spanish stamps issued in the ′80s. So there are 15+9=24 European stamps listed in the table in the ′80s.
Answer: D.
The problems on this page are the property of the MAA's American Mathematics Competitions