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There are 102 books in a and B bookshelf, 24 of which are taken from a and put into B. two thirds of B's bookshelf is exactly three fourths of a's bookshelf, and B's original books speed
If there are x books on shelf B, there are 102-x books on shelf a, 102-x-24 books on shelf a and X + 24 books on shelf B
3/4*(102-x-24)=2/3*(x+24)
9*(78-x)=8*(x+24)
702-9x=8x+192
8x+9x=702-192
17x=510
x=30
A: there are 30 books on shelf B
The number of parts processed by Party A is 9 / 13 of that of Party C, and the number of parts processed by Party C is 1 / 3 of that of Party B. the number of 156 parts processed by Party B is known to be calculated
The number of parts processed by Party A is 9 / 13 of the number processed by Party C, and the number of parts processed by Party C is 1 / 3 of the number processed by Party B. the number of parts processed by Party B is 156, and the equation for how many parts processed by Party A is obtained
Let a process x
X/（9/13）=156*1/3
X=36
A processed 36
There are 102 books in the two bookshelves. If 24 books are taken out of bookshelf A and put into bookshelf B, two-thirds of the books in bookshelf B are exactly three-quarters of bookshelf a
x+y=102
x-24=(y+24)*2/3
Three thirds of the total number of parts processed by a, B and C is 1
How many are processed?
180*（1-1/3-1/3*1/3）
=180*（1-1/3-1/9）
=180*5/9
=100
180-180 × 1 / 3-180 × 1 / 3 × 1 / 3 = 100.
There are two bookshelves. There are 50 fewer books on bookshelf a than on bookshelf B
Take 65 books from a bookshelf and put them into B bookshelf. At this time, the number on B bookshelf is twice that of A. a bookshelf has several books. It should be suitable for sixth grade primary school students, and there should be a process. Please help me!
Hope to tell me how to solve the problem and why
There are x books in the original a bookshelf
(x+50+65)=2*(x-65)
x+110=2x-130
2x-x=110+130
x=140
A: there were 140 books on shelf a
Analysis: such a problem is to set the unknown number, according to the equation to list the linear equation of one variable, and then solve it. For example, x + 50 in this problem represents the book on shelf B
A, B and C process 1480 parts at the same time, one part, a 6 minutes, B 9 minutes, C 7?
It's better to set up equations!
Because processing at the same time, so the time is equal
It took X minutes
X/6+X/9+X/7.5=1480
Solve this equation, calculate the time, and then divide it by 6, 9, and 7.5 respectively
The processing number is set as a, B and C respectively
Then 6A = 9b = 7.5c can be obtained by the joint completion
And a + B + C = 1480
The solution is a = 600, B = 400, C = 480
There are 600 books in the two bookshelves. If you take 50 books out of the first bookshelf and 10 books out of the second bookshelf
The books on the two shelves are equal. How many books did a and B have?
If there are x books on shelf a, there are 600-x books on shelf B
X-50=600-X-10
We can get x = 320
600-X=280
A: there were 320 copies.
There were 280 copies.
If you need 3.5 minutes to complete the part processing task, how much time does it take for you to complete the part processing?
1825 △ 13 + 13.5 + 14, = 1825 △ 7384, = 2100 (minutes), 2100 × 13 = 700 (pieces), 2100 × 13.5 = 600 (pieces), 2100 × 14 = 525 (pieces), answer: a processes 700 parts, B processes 600 parts, C processes 525 parts
There are 400 books in a and B bookshelves. If 50 books are taken out of a bookshelf and 10 books are taken out of B bookshelf, the number of books in the two bookshelves is equal. How many books are there in a and B bookshelf?
(400-50-10) △ 2 = 170 (this)
So a bookshelf: 170 + 50 = 220 (this)
B bookshelf: 170 + 10 = 180 (copies)
It takes 3 minutes for a part to be processed, 3 minutes for B and 4 minutes for C. now there are 1825 parts to be processed. In order to complete the task as soon as possible, A. B. C
How many pieces are processed and how long does it take?
Setting: the time required to complete the task is X minutes
x/3+x/3.5+x/4=1825
The solution is: x = 2100
- 2100 = 3
2100 △ 3.5 = 600 (pieces)
2100 △ 4 = 525
Therefore, a should process 700 parts, B should process 600 parts and C should process 525 parts
RELATED INFORMATIONS
- 1. There are two bookshelves. There are 600 books in bookshelf a, one third of which are borrowed from bookshelf a, and three fourths of which are borrowed from bookshelf B. after that, there are 150 more books on bookshelf a than two times of those on bookshelf B. how many books are there in bookshelf B?
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- 14. 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?
- 15. There are two bookshelves, a and B. There are 600 books in a bookshelf, one third of which are borrowed from a bookshelf After lending 1 / 6 of the books from bookshelf B, the number of books on bookshelf A is 100 more than twice that on bookshelf B. how many books are there on bookshelf B?
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- 17. There are two bookshelves A and B. the first bookshelf has 120 books. If you take 24 books from the first bookshelf to the second bookshelf, the 23 books in the second bookshelf is exactly 75% of the first bookshelf. How many books did the second bookshelf have?
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- 19. The number of books on the upper shelf is 105 more than that on the lower shelf. After taking 25 books from the upper shelf to the lower shelf, the number of books on the lower shelf is four fifths of that on the upper shelf?
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