In P.E. class, Xiaoming used to run 100 meters in 18 seconds, but now it only takes 15 seconds. What percentage has his speed increased?

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• 1. In a PE class, the whole class is arranged in four rows (the number of people in each row is equal). The position of Xiaofang row is: the sixth from the front, the seventh from the back. How many students are there in this class?
• 2. In PE class, it takes 30 seconds for Xiaoming to run 100 meters, 12 seconds for Xiaojie to run 50 meters, and 8 seconds for Xiaohong to run 30 meters. Which of the three of them is the fastest?
• 3. Do the same number of questions, Xiaofang 8 points to do 75 questions, Xiaoli 9 points to do 85 questions, who do fast
• 4. In the rope skipping competition, Xiao Hong jumped 18 times and Xiao Li 30 times. Xiao Fang jumped more than Xiao Hong and less than Xiao Li, It's a multiple of the difference between the number of rope skipping between Xiao Hong and Xiao Li. Please count how many times Xiao Fang jumped
• 5. Xiao Fang and Xiao Li jump rope. Xiao Fang jumps 30 times less than Xiao Li. Xiao Fang jumps seven fifths of Xiao Li's. how many times have they jumped? Xiao Fang and Xiao Li jump rope. Xiao Fang jumps 30 times less than Xiao Li. Xiao Fang jumps five seventh of Xiao Li's. how many times have they jumped?
• 6. Xiaohong, Xiaofang and Xiaoli are divided into 55 pieces of sugar. Xiaohong gets twice as many pieces as Xiaofang, and Xiaoli gets the least, but more than 10 pieces. How many pieces of sugar do they get I'll give you more points
• 7. 1. Xiaoli, Xiaoming, Xiaoliang, Xiaofang's average height is 110cm. If Xiaodong's average height is 120cm, what's Xiaodong's height? 2. A and B planes fly out from two cities at the same time. After two hours, the planes meet at 120 kilometers from the midpoint. At this time, the ratio of the distance traveled by the planes is 3:2. What's the speed of the two planes? 3. The goods in the supermarket are sold out in three days. 50% of the total goods are sold in the first day. 210 more goods are sold in the third day than in the second day. The ratio of the number of goods sold in the second day to that in the third day is 5:8. How many goods are sold in these three days? Write to do so, write in plus 10 points
• 8. Xiaoli is 1 / 10 higher than Xiaofang, and Xiaofang is 0.13 meters shorter than Xiaoli. How tall is Xiaofang?
• 9. Xiaoli is 140 cm tall. Xiaoqin is 1 / 10 meter higher than Xiaoli. Xiaofang is 1 / 10 higher than Xiaoli. Compared with Xiaofang, () ① Xiaoqin is higher; Xiaofang is higher; they are the same height; they are not sure But the unit is different
• 10. Xiaoming and Xiaojun are 2.22 meters tall, Xiaoming and Xiaoli are 2.20 meters tall, Xiaojun and Xiaoli are 2.24 meters tall. Can you calculate everyone's height
• 11. Xiaofang's result of 100 meters is 18 seconds, which is 2 seconds slower than Xiaoming's. how many seconds did Xiaoming take to run 100 meters
• 12. Xiao Fang and Xiao Li collected 140 stamps, and Xiao Li's number is 2 / 5 of Xiao Fang's. how many stamps do they collect each? If you can, please ask elder brother and elder sister at 1:00
• 13. Xiaoyu and Xiaoli run in the 100 meter race, and each time Xiaoyu reaches the finish line 10 meters earlier than Xiaoli. If Xiaoyu goes back 10 meters to compete with Xiaoli, they start at the same time, and their average speed is the same as before, the result is () A. Xiao Li comes to the end first B. Xiao Yu comes to the end first C. go to the end together D. not sure
• 14. Xiaofang weighs one fifth more than Xiaoli, and the weight ratio of Xiaofang to Xiaoli is ()
• 15. Xiao Fang did 48 questions in 3 minutes and made 5 mistakes. Xiao Li did 70 questions in 5 minutes and made 9 mistakes. Who has the highest accuracy
• 16. Xiao Ming walks 100 meters every minute. Xiao Ming goes to school 1200 meters. Xiao Li's home goes to school 800 meters. Xiao Li walks 2 minutes late. How many meters does Xiao Li walk every minute Xiao Ming walks 100 meters every minute. Xiao Ming goes to school 1200 meters. Xiao Li's home goes to school 800 meters. Xiao Li walks 2 minutes late and asks Xiao Li how many meters she walks every minute. They can go to school at the same time
• 17. In the 100 meter race, Xiao Dong took 18 seconds and Xiao Ming one fourth of a minute. Who can run fast?
• 18. In the 100 meter race, Xiao Ming ran for 14 seconds and Xiao Li ran for 18 seconds. How many seconds did they use for each meter on average? Who runs fast? The answer is to score,
• 19. Xiaohong, Xiaoli, Xiaofang and Xiaocui are four people who make big red flowers for children in kindergarten. Each of them has to make five. Now they have made three big red flowers. How many big red flowers do each of them have to make? How many big red flowers do they have to make altogether?
• 20. In the triangle ABC, the angle ACB is 90 degrees, CD is perpendicular to point D, point E is on point AC, CE = BC, make a vertical line of AC through point E, and intersect the extension line of CD at point F Prove that angle a is equal to angle F