Fill in the blanks with an appropriate word, phrase, or symbol(s).

It is believed that the Mayans used 18 × 20 instead of 20^{2} so that their numeration system would conform to their ________ , which had 360 days.

A Survey Of Mathematics With Applications

11th Edition

Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde

ISBN: 9780135740460

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