TSK · Numbers 18:16

This they shall give, every one that passeth among them that are numbered, half a shekel after the shekel of the sanctuary: (a shekel [is] twenty gerahs:) an half shekel [shall be] the offering of the LORD.

And all thy estimations shall be according to the shekel of the sanctuary: twenty gerahs shall be the shekel.

And the shekel [shall be] twenty gerahs: twenty shekels, five and twenty shekels, fifteen shekels, shall be your maneh.