15 alligators eaten over a period of 3 weeks is a rate of 15/3=<<15/3=5>>5 alligators per week.

Under the normal rate of 1 alligator per week per python, it would take 5/1=<<15/3=5>>5 pythons to eat 15 alligators in 3 weeks.

# Answer

5
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If one Burmese python can eat one 50-cm alligator per week, how many Burmese pythons would it take to eat fifteen 50-centimeter alligators in three weeks?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
If one Burmese python can eat one 50-cm alligator per week, how many Burmese pythons would it take to eat fifteen 50-centimeter alligators in three weeks?
train