In the second anthill, there are 20/100 * 100 = <<20/100*100=20>>20 ants less.

This means there are 100 - 20 = <<100-20=80>>80 ants in the second anthill.

In the third anthill, there are 20/100 * 80 = <<20/100*80=16>>16 ants less compared to the second one.

So in the third anthill, there are 80 - 16 = <<80-16=64>>64 ants.

# Answer

64
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
In a forest, there are three anthills. In the first anthill, there are 100 ants, and in each next anthill, there are 20% fewer ants than in the previous one. How many ants are in the third anthill?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
64
In a forest, there are three anthills. In the first anthill, there are 100 ants, and in each next anthill, there are 20% fewer ants than in the previous one. How many ants are in the third anthill?
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