A = <<4=4>>4 floors

B = 4 + 9 = <<4+9=13>>13 floors

C = (13 * 5) - 6 = <<13*5-6=59>>59 floors

Building C has 59 floors.

# Answer

59
<|im_start|>system
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<|im_start|>user
Building A has 4 floors, which is 9 less than Building B. Building C has six less than five times as many floors as Building B. How many floors does Building C have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
59
Building A has 4 floors, which is 9 less than Building B. Building C has six less than five times as many floors as Building B. How many floors does Building C have?
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