answer the riddle

Question

Twice eight are ten of us, yet ten is just three.
Five of us are seven.
Can you now see?
If this is not enough, I will tell you a bit more.
Eight of us are nineteen, and nine is just four.

Answer 1

twice eight=10 letters

ten=3 letters

ten=3 letters

five of us are seven, seven=5 letters

nineteen=8 letters

nine=4 letters

letters of the alphabet