In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
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Question: Black people live about _ fewer years, on average, than white people do.

Answer: six

Question: Sturgeons are shark-like in form but are unique in having _ rows of bony plates along the body.

Answer: five

Question: Brazil leads the world with more than _ billion gallons of ethanol produced each year.

Answer:
four