What civilization developed mathematical system that was based on the number 20?Group of answer choicesIncaOlmecAztecMayan

The civilization that developed a mathematical system based on the number 20 is the Mayan civilization. The Maya had a sophisticated understanding of mathematics and astronomy, and they used a vigesimal (base-20) numeral system. This system was particularly useful for their calendar calculations and had unique symbols for the numbers ranging from zero to 19, as well as for larger values formed using these base units.

In addition to being a base-20 system, the Mayan number system included a concept of zero, which was a significant mathematical advancement for that time. The Mayans used this system to build complex calendars and to perform astronomical calculations, showcasing their advanced knowledge in both math and science.

In conclusion, among the options given, the Mayan civilization is the correct answer.