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Claire paid a total of $1 .60 for stamps, some of which cost $0.20 each, and the rest of them cost $0.15 each. How many 20-cent stamps did Claire buy?
(1) Claire bought exactly 9 stamps.
(2) The number of 20-cent stamps Claire bought was 1 more than the number of 15-cent stamps she bought.
[spoiler]OA=D[/spoiler]
Source: Official Guide
(1) Claire bought exactly 9 stamps.
(2) The number of 20-cent stamps Claire bought was 1 more than the number of 15-cent stamps she bought.
[spoiler]OA=D[/spoiler]
Source: Official Guide
