There are two bookshelves of science and technology books in the library of the school. If one fifth of the books on the first bookshelf are put into the second bookshelf, the number of books on the two bookshelves is equal. If the first bookshelf has 100 books, how many books on the second bookshelf?

If one fifth of the books on the first bookshelf are put into the second bookshelf, so that the number of books on the two bookshelves is equal, then the books on the second bookshelf are only 1-1 / 5-1 / 5 = 3 / 5 of the first bookshelf
The second bookshelf was originally 100x3 / 5 = 60 books
Party A and Party B process a batch of parts at the same time. In the first three hours, they process a total of 126 pieces. In the last five hours, party a first spends an hour repairing tools. Therefore, Party A processes 10 pieces more per hour than before. As a result, Party A processes 10 pieces more than Party B in the later period of time. How many pieces did Party A and Party B process each hour?
Let a process x pieces per hour, B process y pieces per hour. From the meaning of the question, 3 (x + y) = 1264 (x + 10) = 5Y + 10, the solution is: x = 20Y = 22. Answer: a process 20 pieces per hour, B process 22 pieces per hour
In the school library, there are 1500 books on bookshelf A and 1200 books on bookshelf B. the books on the two bookshelves just account for 3 / 14 of the total number of books
How many books are there in the school library?
(1500 + 1200) / 3 / 14 = 12600 (volume)
Party A and Party B process a batch of parts at the same time. In the first three hours, they process a total of 126 pieces. In the last five hours, party a first spends an hour repairing tools. Therefore, Party A processes 10 pieces more per hour than before. As a result, Party A processes 10 pieces more than Party B in the later period of time. How many pieces did Party A and Party B process each hour?
Let a process x pieces per hour, B process y pieces per hour. From the meaning of the question, 3 (x + y) = 1264 (x + 10) = 5Y + 10, the solution is: x = 20Y = 22. Answer: a process 20 pieces per hour, B process 22 pieces per hour
The ratio of the upper and lower layers of a bookshelf is 8:7. Take 8 books from the upper layer and put them on the lower layer. At this time, the ratio of the upper and lower layers is 4:5?
What's the formula
It turns out that the upper layer is the total number of two layers: 8 (8 + 7) = 8 / 15
Now the upper layer is the sum of the two layers: 4 (4 + 5) = 4 / 9
8 / 15-4 / 9 = 24 / 45-20 / 45 = 4 / 45
The total number of two floors is: 8 △ 4 / 45 = 90 copies
Original upper layer: 90 × 8 / 15 = 48
Original lower layer: 90-48 = 42
If you don't understand, please ask
8 divided by (8 / 15-4 / 9) = 90 & nbsp; & nbsp; upper: 90 times 8 / 15 = 48 & nbsp; & nbsp; lower: 90-48 = 428 divided by (5 / 9-7 / 15) = 90 & nbsp; & nbsp; lower: 90 times 7 / 15 = 42 & nbsp; & nbsp; upper: 90-42 = 48 & nbsp;
Party A and Party B process a batch of parts at the same time. In the first three hours, they process a total of 126 pieces. In the last five hours, party a first spends an hour repairing tools. Therefore, Party A processes 10 pieces more per hour than before. As a result, Party A processes 10 pieces more than Party B in the later period of time. How many pieces did Party A and Party B process each hour?
Let a process x pieces per hour, B process y pieces per hour. From the meaning of the question, 3 (x + y) = 1264 (x + 10) = 5Y + 10, the solution is: x = 20Y = 22. Answer: a process 20 pieces per hour, B process 22 pieces per hour
In a bookshelf, the ratio of the upper and lower books is 8:7. Take 8 books from the upper layer and put them on the lower layer. At this time, the ratio of the upper and lower books is 4:5
It turned out that the upper level accounted for 20% of the total
= 8 out of 15
Now the upper class accounts for half of the total
4 ÷ (4 + 5) = 4 / 9
Total
8 ÷ (8 / 15-4 / 9) = 90
It turns out that there are some on the upper floor
90 × 8 / 15 = 48
It turns out that there are some in the lower layer
90-48 = 42
The ratio of books on the upper shelf to that on the lower shelf is 8:7, and the ratio of books on the upper shelf to that on the lower shelf is 8 / (8 + 7) = 8 / 15
Take 8 copies from the upper level and put them in the lower level. At this time, the ratio of the upper level to the lower level is 4:5. Now the upper level accounts for 4 / (4 + 5) = 4 / 9 of the total
Therefore, 8 books account for 8 / 15-4 / 9 = 4 / 45 of the total
So the total number is 8 / 4 / 45 = 90
The original upper layer has 90 × 8 / 15 = 48 copies
There are 90-48 = 42 in the lower layer
There are 48 in the upper layer and 42 in the lower layer
Party A and Party B process a batch of parts at the same time. In the first three hours, they process a total of 126 pieces. In the last five hours, party a first spends an hour repairing tools. Therefore, Party A processes 10 pieces more per hour than before. As a result, Party A processes 10 pieces more than Party B in the later period of time. How many pieces did Party A and Party B process each hour?
Let a process x pieces per hour, B process y pieces per hour. From the meaning of the question, 3 (x + y) = 1264 (x + 10) = 5Y + 10, the solution is: x = 20Y = 22. Answer: a process 20 pieces per hour, B process 22 pieces per hour
For a bookshelf, the original ratio of books in the upper and lower layers is 8:7. If you take out 8 books from the upper layer and put them in the lower layer, then the ratio of the upper and lower layers is 4:5. How many books are there in the upper and lower layers?
There are 48 books in the upper layer and 42 books in the lower layer. A: there are 48 books in the upper layer and 42 books in the lower layer
A, B and C process a batch of parts. A processes 33 parts per hour. B processes 3 parts per five minutes. C processes 13 parts per twenty minutes
C

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