'Twenty' in the Bible

And you will put the value of a male from twenty years to sixty years old at fifty shekels of silver, by the scale of the holy place.

And if the person is from five to twenty years old, the value will be twenty shekels for a male, and ten for a female.

And let all your values be based on the shekel of the holy place, that is, twenty gerahs to the shekel.