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Mathematics 16 Online
OpenStudy (anonymous):

Lea buys 20 picture frames. Some are 4 in. by 6 in. frames which cost $5.80 each, and the rest are 5 in. by 7 in. frames that cost $9.60 each. She spends a total of $80.80. Which equation models this situation? Let f represent the number of 4 in. by 6 in. frames she buys.

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