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serio walked to and from school on 3/5 of the days in one month. He got a ride to school on 7/8 of the remaining days. On the remaining school day that month he stayed home with a cold. How many school days were there that month?

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3/5 d + [7/8 (2/5 d)] + 1 = d

3/5 d + 7/20 d + 1 = d

12/20 d + 7/20 d + 1 = d

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