To make the yogurts, Vivian needs 5 x 8 = <<5*8=40>>40 banana slices.

She needs to buy 40 / 10 = <<40/10=4>>4 bananas.

# Answer

4
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Each yogurt is topped with 8 banana slices.  One banana will yield 10 slices.  If Vivian needs to make 5 yogurts, how many bananas does she need to buy?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
Each yogurt is topped with 8 banana slices.  One banana will yield 10 slices.  If Vivian needs to make 5 yogurts, how many bananas does she need to buy?
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