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?
In the second anthill, there are 20/100 * 100 = 
<gadget id="calculator">20/100*100</gadget>
<output>20</output>
20 ants less.
This means there are 100 - 20 = 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80 ants in the second anthill.
In the third anthill, there are 20/100 * 80 = 
<gadget id="calculator">20/100*80</gadget>
<output>16</output>
16 ants less compared to the second one.
So in the third anthill, there are 80 - 16 = 
<gadget id="calculator">80-16</gadget>
<output>64</output>
64 ants.

<result>64</result>