Pls you curtis kept track of the number of miles he ran each day for 10 days. by day 4, he had already run 9 miles. how many days did it take curtis to run 21 miles? a. 7 days b. 9 days c. 25 days d. 30 days

Didnt say if he ran the same amount everyday

I got around 9 days but the answer was 20.99999997

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