'Twenty' in the Bible

If your valuation is of the male from twenty years even to sixty years old, then your valuation shall be fifty shekels of silver, after the shekel of the sanctuary.

If it be from five years even to twenty years old then your valuation for the male shall be twenty shekels and for the female ten shekels.

Every valuation of yours, moreover, shall be after the shekel of the sanctuary. The shekel shall be twenty gerahs.