Where does “पञ्चविंशति” come from?
पञ्चविंशति (Sanskrit) comes from Sanskrit विंशति, from Proto-Indo-Aryan HwiHśatí, from Proto-Indo-Iranian HwiHćati, from Proto-Indo-European h₁wih₁ḱm̥t, from Proto-Indo-European dwi(h₁)dḱm̥ti — two tens; two decades; twenty; two-ten.
Ancestry of “पञ्चविंशति”, step by step