Calculus
posted by Anonymous on .
As part of a fitness program, Annie walks for 35 mins on day 1, and increases the walking time by 8 mins each day. She completes the fitness program on the day she first spends more than 3 hours walking. The program is completed on what day?
This is how I did it.
3 hours would be equal to 180 mins.
180 = 35 + (n1)(8)
180 = 35 + 8n8
180 = 27 + 8n
153 = 8n = 19.125. If I round that, then it would be 20. So I had to round it to get an answer, am I supposed to get a whole number in the starting?

Yes. They ask what day. That would be day 20. At the end of day 19, she still had not walked for 3 hours.
They didn't ask at what point she had walked three hours, but rather the day number.