The construction site needs 1280 bags of cement, which can be transported by 8 cars four times. How many bags can a car transport at a time?

The construction site needs 1280 bags of cement, which can be transported by 8 cars four times. How many bags can a car transport at a time?

A: a car can transport 40 bags at a time
Xiao Ming has a 100 page story book. He reads one page on the first day, three pages on the second day and five pages on the third day. Do you know how many days it will take Xiao Ming to finish this book
How many pages do you read on the last day? Please write down the rules of Xiaoming's reading and finish it in a few days
Find the rule: the number of pages read on the nth day is 2N-1, forming an arithmetic sequence, then on the nth day I read a total of [1 + (2n-1)] * n / 2 = n * n = 100, then n = 10, that is, I read it on the 10th day. This is a famous story, please read the story of the second grade of mathematics teaching Gauss primary school on the Internet
It is more important to train children's thinking and guide them to think than to do questions
From city a to city B, it takes 5 hours for passenger cars and 7 hours for freight cars to complete the whole journey
So it takes 1 / 5 hour for the whole journey,
It takes 7 hours for the truck to complete the whole journey, so it takes 1 / 7 of the whole journey every hour
So the two cars travel 1 / 5 + 1 / 7 of the whole journey every hour
The bus didn't leave until one hour after the truck left, which means that the truck was one seventh of the way, and the bus left at six seventh of the way,
Therefore, the time of two truck lines, that is, the time of truck lines, is as follows:
(1-1 / 7) / (1 / 5 + 1 / 7) = 6 / 7 / 12 / 35 = 2.5 hours
There are 1680 tons of grain in the two warehouses. It is known that the grain stored in warehouse A is three-quarters of that in warehouse B. how much grain is stored in each warehouse
B warehouse: 1680 / (1 + 3 / 4) = 960 tons
A warehouse: 1680-960 = 720 tons
In this paper, we use the linear equation of one variable to suppose that the grain in Bin B is x tons, and the grain in Bin A is 3 / 4x tons
7/4x＝1680 x＝960
Then 3 / 4x = 720 A: 720 tons for warehouse A and 960 tons for warehouse B
Do you know how to use equation in sixth grade
'/', which means a fraction line
The 1680 and the 7 in the middle are separate
Fill in 3, 5, 9, 17______ 、______ 、129…
17-9 = 88 × 2 = 1617 + 16 = 3333 + 16 × 2 = 65, so the answer is: 33, 65
Xiao Ming read a story book. He read 30% on the first day, 35 pages on the second day, and 5 more pages on the third day than on the first day. How many pages did he finish
The whole book has: (35 + 5) / (1-30% - 30%) = 100 pages
(35 + 5) / (1-30% × 2) = 100 pages
A: the book has 100 pages
Total = (35 + 5) / (1-30% - 30%) = 100 pages
It takes 8 hours for the bus to arrive from city a to city B. what's the average percentage of the whole journey per hour? What's the percentage of the whole journey per 5 hours?
It takes 8 hours to get from city a to city B, 1 / 8 of the whole journey per hour and 5 / 8 of the whole journey in 5 hours
There are two granaries A and B. warehouse B has 500 tons of grain, 20% less than warehouse A. how many tons less than warehouse a?
Warehouse A: 500 (1-20%) = 625 tons
Warehouse B is 625-500 tons less than warehouse a = 125 tons
Happy study!
125 tons of questions: Formula
How to do 1 / 1 * 3 + 1 / 3 * 5 + 1 / 5 * 7 + 1 / 7 * 9.1/17 * 19 + 1 / 19 * 21?
It's easy to calculate
1/1*3+1/3*5+1/5*7+1/7*9.1/17*19+1/19*21=1/2*(1-1/3)+1/2*(1/3-1/5)+1/2*(1/5-1/7)+1/2*(1/7-1/9)+.+1/2*(1/17-1/19)+1/2*(1/19-1/21)=1/2*(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+.+1/17-1/19+1/19-1/21)=1/2*(1-1/21)=1...
Xiao Ming read a story book. On the first day, he read 3 / 7 of the whole book. On the second day, he read 2 / 5 of the whole book. On the third day, he read the rest
What percentage of the book did you read on the third day?
The third day = 1-3 / 7-2 / 5 = 6 / 35