There were shekels of different weights. This is the one that people had to use in the sanctuary of the sacred tent. (See: [[rc://en/ta/man/translate/translate-bweight]])
The purpose of this sentence is to tell how much the sanctuary shekel weighs. The gerah was the smallest unit of weight that the Israelites used. AT: "One shekel must equal twenty gerahs" (See: [[rc://en/ta/man/translate/translate-bweight]])
# Twenty gerahs must be the equivalent of one shekel
If it is necessary to use modern weight units, here is a way to do it. AT: "One shekel must weigh ten grams" (See: [[rc://en/ta/man/translate/translate-numbers]] and [[rc://en/ta/man/translate/translate-bweight]])