Solution: Average tea picking (128.5+1410.5)/(14+16) = 270/30 = 9 kg.

2. Zhenhua Primary School sent pine saplings 140 and tung saplings 130 to three classes in grade six. How many trees are planted in each class on average?

Solution: The average number of species per species (140+130)/3 = 270/3 = 90.

3. Military training for college students in summer vacation, marching for 4.5 hours in the morning, marching for 4.6 kilometers per hour on average, and marching for 2.5 hours in the afternoon 10.3 kilometers. How many meters per hour is this day?

Solution: Average hourly travel (4.6× 4.5+10.3)/(4.5+2.5) = 31/7km ≈ 442.86m.

4. Use one car to transport two piles of coal. The first pile is 28 tons, and the second pile is 2 1 ton. The car made four trips on the first day and three trips on the second day, just to finish this pile of coal. How many tons per shipment?

Average shipment (28+2 1)/(4+3)=49/7=7 tons.

Li Hua got 92 points in Chinese, 98 points in math and 95 points in English in the mid-term exam. What is the average score of these three subjects?

Average grade =(92+98+95)/3=285/3=95 points.

6. An engineering team repairs roads, with an average of10.5km per day for the first five days and13.2km per day for the last six days. How many kilometers a day? (The number shall be kept to one decimal place)

Average daily road construction (10.5× 5+13.2× 6)/(5+6) =131.711material/kloc-0.

7. The contractor fertilizes the wheat. The first plot is 4 hectares, 0.39 tons per hectare, and the second plot is 3 hectares, with * * * fertilization 1.3 1 ton. How many tons per hectare on average?

Average fertilizer application per hectare = (0.39× 4+1.31)/(4+3) = 2.87/7 = 0.41ton.

8. Small chemical fertilizer plants carry out water-saving activities, saving 2.4 tons of water every day in the first three days of this week and 20. 1 ton in the last four days. How many tons of water are saved on average every day this week?

Average daily water saving = (2.4× 3+20.1)/7 = 27.3/7 = 3.9 tons.

9. The road team repaired the road in June, with 2400 meters repaired in the first 12 days and 250 meters repaired in the last 18 days on average. How many meters have been built this month?

The average daily maintenance this month is (2400+250×18)/30 = 6900/30 = 230m.

10. Three classes in grade six took part in the math competition. There are 40 students in a class, with an average of 9 1 minute; There are 38 students in Class Two, with an average score of 92.5. There are 39 students in 3 classes, with an average score of 9 1.8. What is the average score of the sixth grade in this math contest? (Figures shall be kept to two decimal places)

Average score = (91× 40+92.5× 38+91.8× 39)/(40+38+39) =10735.2/1.

1 1. A greening team planted trees. In April, 2,670 trees were planted in the first 14 days, and 180 trees were planted every day in the last 16 days. How many trees are planted every day in April?

Plant trees every day (2670+180×16)/30 = 5550/30 =185.

12. In a test, Wang Ying scored 94 points in Chinese, 4 points more than math, and 90 points in English. Math scores are the same as English scores. What's the average score in Wang Ying?

Average grade (94+90+90)/3≈9 1.33.

13. Five identical trucks were used to transport goods. On the first day, 105 tons was delivered, and on the second day, 170 tons was delivered, which was four times more than that on the first day. How many tons does each truck transport at a time?

Average freight (170-105)/4 = 65/4 =16.25 tons.

14. The distance from the barracks to the town is 48 kilometers. It took the soldiers 4.6 hours to get to the town from the military camp, and only 3.4 hours to speed up when they came back. How many kilometers do soldiers travel back and forth per hour on average?

Average hourly line (48× 2)/(4.6+3.4) = 96/8 =12km.