Albert Barnes Commentary Esther 9:16

"And the other Jews that were in the king`s provinces gathered themselves together, and stood for their lives, and had rest from their enemies, and slew of them that hated them seventy and five thousand; but on the spoil they laid not their hand." — Esther 9:16 (ASV)

Seventy and five thousand - The Septuagint gives the number as 15,000; and this amount seems more in proportion to the 800 slain in Susa.