'Fifty' in the Bible

When He had destroyed seven nations in the land of Canaan, He distributed their land as an inheritance—all of which took about four hundred and fifty years.

And after that he gave unto them judges about the space of four hundred and fifty years, until Samuel the prophet.

Many of them also which used curious arts brought their books together, and burned them before all men: and they counted the price of them, and found it fifty thousand pieces of silver.