Estimate the answer. If the calculated answer is close to the estimate then it is reasonable.
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for Imagine That Amy Counted 60 Numbers Per Minutes And Continued To Count Non Stop Until She Reached 5,000 Determine A Reasonable Estimate Of The Number Of Hours A Would Take Amy To Complete the Counting
That is the correct spelling of the word "reasonable."
12 centimetres is a reasonable estimate.
One adjective from the word "reason" is "reasonable."
Whether or not it is reasonable depends on the context - which has not been provide.