Let me see, it can be calculated as follows: first, you can set this glass of juice as1; The first time I drank a fifth, the remaining 0.8 was 0.2. Drinking a quarter is 0.2, so the total * * * will drink 0.4 juice, leaving 0.6; Full milk is 0.4 milk.

The glass contains 0.6 cup of juice and 0.4 cup of milk. If you drink half, you can drink 0.3 juice and 0.2 milk. At this time, there are 0.3 juice and 0.2 milk left.

Last time, I drank a third, a third of milk and a third of juice.

Then at this time, the juice wine was drunk by 0. 1, and finally there was 0.2 left.

So it used to be 1, and now it is 0.2, which is one fifth of the original juice. I think it should be, um, it should be like this.

Let me think about the second question.

First, the efficiency of A is one-fiftieth and one-sixtieth of that of B. Two people will complete 50 and 60 every day, which is 300 1 1.

Note that on 15, Party A rested for 5 days and Party B rested for 3 days. 1 1 is 300 points, multiplied by 15, minus 50 points of A's rest days multiplied by 5, minus 60 points of B's rest days multiplied by 3, and finally the efficiency of 15 days is 0.4.

Then there are two 15 days, which is 0.8, leaving 0.2.

If it is 0.2, it is assumed that in five days, it is 1 1 times 5 minus A's rest day, 50 is 300, and 49 is less than 0.2. Then, in one day, if B doesn't do it, it is equal to A's doing plus 50, which finally equals 55 of 300, and then on the seventh day, it is equal to B's doing plus 60, which finally equals.

So the end result is 37 days.

It's 37. Oh, I think it's right! ! ! ! Yes, that's right! ! ! !