TSK · Numbers 18:16

They shall give this, everyone who passes over to those who are numbered, half a shekel after the shekel of the sanctuary; (the shekel is twenty gerahs;) half a shekel for an offering to Yahweh.

All your valuations shall be according to the shekel of the sanctuary: twenty gerahs to the shekel.

The shekel shall be twenty gerahs. Twenty shekels plus twenty-five shekels plus fifteen shekels shall be your mina.