There’s a total of 4 x 12 = <<4*12=48>>48 slices.

After the guests eat, there are 48 - 39 = <<48-39=9>>9 pieces.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
At a pool party, there are 4 pizzas cut into 12 slices each.  If the guests eat 39 slices, how many slices are left?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
9
At a pool party, there are 4 pizzas cut into 12 slices each.  If the guests eat 39 slices, how many slices are left?
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