Human: Lisa and Peter are selling chocolate bars door to door. Lisa sold three and a half boxes of chocolate bars, and Peter sold four and a half boxes. They sold 64 chocolate bars together. How many chocolate bars are in a box? Assistant: 
Define a variable ** Let B stand for the number of chocolate bars in a box.
How many chocolate bars did Lisa sell? ** Lisa sold 3 1/2 * B bars.
How many chocolate bars did Peter sell? ** Peter sold 4 1/2 * B bars.
How many chocolate bars did Lisa and Peter sell together? ** Together, they sold 3 1/2 * B + 4 1/2 * B = 8B = 64 bars.
How many chocolate bars are in a box? ** Therefore, there are B = 64 / 8 = <<64/8=8>>8 chocolate bars in a box.
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