Average application 2 1. After reading a book for 37 days, Xiao Jun still had 1 / 3 of the original book. After that, he read 12 pages a day and another 5 days, just finished. How many pages does he read every day? 2. Someone goes up the mountain at the speed of 3 kilometers per hour, and goes back along the original road at the speed of 6 kilometers per hour when he goes down the mountain? 3. A tractor plows two identical plots of land. The first plot plows 20 mu per day on average, and the second plot plows 16 mu per day on average. After all the two plots are plowed, how many mu per day does the Tractor Plow? 4. There are four numbers. From the second number, each number is three more than the previous one. The average of these four numbers is 24.5. What is the largest of these four numbers? five

Average application 2 1. After reading a book for 37 days, Xiao Jun still had 1 / 3 of the original book. After that, he read 12 pages a day and another 5 days, just finished. How many pages does he read every day? 2. Someone goes up the mountain at the speed of 3 kilometers per hour, and goes back along the original road at the speed of 6 kilometers per hour when he goes down the mountain? 3. A tractor plows two identical plots of land. The first plot plows 20 mu per day on average, and the second plot plows 16 mu per day on average. After all the two plots are plowed, how many mu per day does the Tractor Plow? 4. There are four numbers. From the second number, each number is three more than the previous one. The average of these four numbers is 24.5. What is the largest of these four numbers? five

1. After reading a book for 37 days, Xiao Jun still had 1 / 3 of the original book. After that, he read 12 pages a day and another 5 days, just finished. How many pages does he read every day?
Total: (12 * 5) / (1 / 3) = 180 pages
Average daily reading: 180 * (37 + 5) = 30 / 7 pages
2. Someone goes up the mountain at the speed of 3 kilometers per hour, and goes back along the original road at the speed of 6 kilometers per hour when he goes down the mountain?
The average speed is: 2 / (1 / 3 + 1 / 6) = 4 km / h
3. A tractor plows two identical plots of land. The first plot plows 20 mu per day on average, and the second plot plows 16 mu per day on average. After all the two plots are plowed, how many mu per day does the Tractor Plow?
Average: 2 / (1 / 20 + 1 / 16) = 160 / 9 mu / day
4. There are four numbers. From the second number, each number is three more than the previous one. The average of these four numbers is 24.5. What is the largest of these four numbers?
five
The sum of the four numbers is: 24.5 * 4 = 98
The largest number + the smallest number is 98 / 2 = 49
The largest number is: (49 + 3 * 3) / 2 = 29