Math Help!!!!!!!!!!!!!!!!!!?

Question: 1st-day 15acres,2nd day-7.5??,3rd day-12acres,4th day - 6 acres,5th day- 4 acres?? and add them up is it 11.5 acres?? Question Q-Mimi sat up next to her grandfather on the big harvesting machine. Mimi and her grandfather harvested 15 acres the first day and half of what was left on the second day. On the thirdy day they harvested 12 acres and half of what was left on the fourth day. On the fifth day there remained four acres to be harvested. How many acres will Mimi and her grandfather have harvested when they finished the job?

Answer: so, on the 5th (and last) day, there remained 4 acres to be plowed. the day before that (the 4th day), they had plowed half of the remaining. so, if they plowed half of the remaining, the other half would have been left over for the next (the 5th and last) day - the 4 acres. so on both the 5th and 4th days, they plowed 4 acres. (8 acres total on 4th and 5th days). on the 3rd day, they plowed 12 acres. 8+12 = 20 acres. on the 2nd day, they plowed half of the remaining. so, if they plowed half of the remaining, the other half would have been left over for the next 3 days (20 acres). so, on the 2nd day, they plowed 20 acres. 20 + 20 = 40 acres. on the 1st day, they plowed 15 acres. 40 + 15 = 55 acres. they plowed a total of 55 acres over the 5 day period, when they finished the job.

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