Casey can hula hoop 3 minutes less than Nancy so she can hula hoop for 10-3 = <<10-3=7>>7 minutes

Morgan can hula hoop three times as long as Casey, who can hula hoop for 7 minutes, so she can hula hoop for 3*7 = <<3*7=21>>21 minutes

# Answer

21
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Nancy can hula hoop for 10 minutes.  Casey can hula hoop 3 minutes less than Nancy.  Morgan can hula hoop three times as long as Casey.  How long can Morgan hula hoop?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
21
Nancy can hula hoop for 10 minutes.  Casey can hula hoop 3 minutes less than Nancy.  Morgan can hula hoop three times as long as Casey.  How long can Morgan hula hoop?
train