47 collect five shekelsa for each one, according to the sanctuary shekel, which weighs twenty gerahs.

Read Numbers 3:47 Using Other Translations

Thou shalt even take five shekels apiece by the poll, after the shekel of the sanctuary shalt thou take them: (the shekel is twenty gerahs:)
you shall take five shekels per head; you shall take them according to the shekel of the sanctuary (the shekel of twenty gerahs),
collect five pieces of silver for each of them (each piece weighing the same as the sanctuary shekel, which equals twenty gerahs).