Quinary (base-5) is a numeral system with five as the base. This originates from the five fingers
on either hand.
In the quinary place system, five numerals from 0 to 4, are used to represent any real number.
According to this method, five is written as 10, twenty-five is written as 100 and sixty is written
as 220.
Many languages[1] use quinary number systems, including Gumatj, Nunggubuyu,[2], Kuurn Kopan Noot[3]
and Saraveca. Of these, Gumatj is the only true "5-25" language known, in which 25 is the higher
group of 5.