Human: 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? Assistant: 
How many alligators are eaten in a week? ** 15 alligators eaten over a period of 3 weeks is a rate of 15/3=<<15/3=5>>5 alligators per week.
How many pythons would it take to eat 15 alligators in 3 weeks? ** 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.
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