How many iron chariots did Jabin king of Canaan have?

Answer: 900

With nine hundred iron chariots, Jabin harshly oppressed Israel for twenty years until Deborah and Barak rose up.

“Then the Israelites cried out to the LORD, because Jabin had nine hundred chariots of iron, and he had harshly oppressed the Israelites for twenty years.”— Judges 4:3 (BSB)