You can buy four chocolate bars and three peanut butter cups for 50 cents, and thee chocolate bars and four peanut butter cups for 48 cents. What is the most candy (ie. number of pieces) you can get for exactly 50 cents?
You can get 7 peanut butter cups and 1 chocolate bar for exactly 50 cents.
If you like you can get 8 peanut butter cups for 48 cents, but that's not what I asked you to do.
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