Two masters and three apprentices can finish it every day: 1÷(20/9)=9/20.

Three masters and two apprentices can finish it every day:1÷ (15/7) = 7/15.

that is

Six masters and nine apprentices can finish it every day: 3*9/20=27/20.

Six masters and four apprentices can finish it every day: 2 * 7/15 =14/15.

Then five apprentices can finish it every day: 27/20-14/15 = 5/12.

So 1 apprentice can finish it every day: 5/12 ÷ 5 =112.

That is, 1 apprentice needs to complete it alone:1÷112 =12 days.

8、

The total score of other students is: 4729-88-85-80-30=4446.

Take the limit, 3 1-59*** has 29 numbers.

There are 3 people in each score, and the total score is 3 * (31+32+...+59) = 3915.

The remaining score is 4446-39 15=53 1.

At this time, the limit is also taken: 79 points, and 3 people count as 237 points.

78 points, 3 people, 234 points

The remaining 53 1-237-234=60.

1 person 60 points

So above 60, there will be * * *: 3+3+ 1 = 10.