In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Compound machines are _ or more simple machines working together.

A: two
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Q: Most people go back to work within _ to three months after having a heart attack.

A: one
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Q: Apples grow on spurs that appear on trees that have been growing for _ to five years.

A:
three
****