'Fifty' in the Bible

And it came to pass after this, that Absalom prepared for himself chariots and horses, and fifty men to run before him.

And the king said to Araunah, No; but I will in any case buy them of thee at a price: neither will I offer up to Jehovah my God burnt-offerings without cost. And David bought the threshing-floor and the oxen for fifty shekels of silver.