4。 For pipes A, B and C, the water flow rate is 4g/ s, the salt content is 20%, the water flow rate of B6g/s comes from 15% brine water, and the water flow rate is C 10g/ s.. After tube C is started, it starts in 2 seconds, stops in 2 seconds, and starts all three tubes at the same time in 5 seconds. 1 min. & gt& gt5。 How much higher are the calligraphy classes, 48 dance classes and painting classes in primary schools in Hong Kong than the dance classes? (Nanning) 6 Xiaoming experimented with mung bean bags. There are 65,438+000 seeds that germinate, but 25 seeds do not germinate, and the germination rate of mung beans is sought. (Wenling, Zhejiang) See page 4. How many minutes do you study the next day? (Wuxi-Jiangsu) 8. As for donations, she donated 4.2 yuan, more 0.4 yuan than Mary, and Mary was more than Xiaohua? (Henan, Anyang) 9. A dress sold at 100 was sold to 20 yuan, but actually sold to 90 yuan. Actual discount? (Xianju, Zhejiang)<>>10. The canteen has delivered 600 Jin of rice, which has been eaten for 4 days and 50 Jin a day. How many kilograms do you eat after five days? (jianye district) 1 1.3 boxes of oranges and 3 baskets of apples weigh less than 24 kg. The average weight of each box is 20 kilograms. What is the weight of each basket? Zhejiang City (AD 12). Collect greening activities. Class 5, Grade 4, the school collected 20 kilograms of species. The third class of grade five receives 60 kilograms, and the general class receives 10 kilograms of trees. (Shanghai) 13. Xiang Qiao built a canal with a length of 2 100 meters and repaired it for 5 days, with an average of 240 meters per day. The remaining tasks need to be completed in three days. How many meters do you need to repair every day on average? Qinhuai District () 14. Xiaoming went to the store to buy three small soccer balls, and paid 20 yuan back 1.85 yuan. How much is each football? (Yinchuan Experimental Primary School) 15. There are 4 teams in the class, and each team has 12 young pioneers. In the "Hope Project" fund-raising activities, * * * donated money from 240 yuan. What is the contribution of each young pioneer? (Shanghai) 16. Yucai Primary School bought 2 small soccer balls and 25 long ropes at a price of ***408.5 dollars. The price of each small football is 48 yuan. What's the price of each long rope? (Jiangsu, South, South), 17. Wang Hua bought Interesting Mathematics and The King of Stories, and * * * had $20. How much is each 2.6 yuan of Interesting Mathematics and each King of Stories? (Yanta District, Xi City)
18。 The motorcade carried 89 tons of goods, three times for the first time, away from 10.5 tons each time. After the remaining five are completed, how many tons will be deleted on average each time? (Shanghai) 19.4 Students play table tennis for 60 minutes. How many minutes is the average per person? (Fujian, Jian 'ou) 20. The average score of Chinese, mathematics and common sense in the final exam is 95, and the average score of Chinese and mathematics is 93. Q: How much is common sense? (Jiangshan, Zhejiang) 2 1. Grade 5 (1) tree planting, with an average of 26 boys and 24 trees on each tree. How many trees do boys and girls plant per capita? There are 22 Nanchang cities (districts). Dong Li buys stationery, 5 yuan. He bought a pencil and got used to it 1.5 yuan. The rest of the money is used to buy exercise books at 0.35 yuan each. How many books can he buy? (Shanghai Changqing School) 23 >. Some apples, if split to kindergarten children, are divided into 6 per person; If split into kindergartens, 3 per share; If two children are divided into large and small classes, can each child share a lot? New 24 (jianye district). The watch factory plans to produce 75 watches every day and complete the task 12 days. Actual completion of tasks 10 days, actual average number of blocks per day? (Wuhan Qingshan Middle School) to carry out environmental protection