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There are 320 popular science books in the University, accounting for two fifths of all books. Science books are equivalent to four thirds of story books. How many story books are there in the library
The school has 320 popular science books, accounting for two fifths of the total books
320 / 2 / 5 = 320 * 5 = 800 copies
Popular science books are equivalent to four-thirds of story books, so story books include:
320 / 3 / 4 = 320 * 4 / 3 = 240 copies
A: there are 240
There are three kinds of books in the Library: story books, science and technology books, and literature and art books. Among them, story books account for 5 points of the total number, and the ratio of science and technology books to Literature and art books is 7 to 8?
The total number of books is X,
There are 2 / 5x storybooks,
There are 8 / 15 × (1-2 / 5x) copies of literature and art books
2/5x-8/15×（1-2/5x）=144
2/25x=144
X = 1800
Therefore, there are 720 story books, 504 science and technology books and 576 literature and art books
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There are three kinds of books in the Library: story books, science and technology books and literature and art books 5. The ratio of science and technology books to story books is 7:8. There are 144 more story books than literature and art books. How many books are there in each of the three categories?
144÷[2
5-（1-2
5-2
5×7
8）]
=144÷[2
5-1
4]
=144÷3
Twenty
=960 (copy)
960×2
5 = 384
384×7
8 = 336
384-144 = 240
A: there are 384 story books, 336 science and technology books and 240 literature and art books
There are three kinds of books in the Library: story books, science and technology books and literature and art books 5. The ratio of science and technology books to story books is 7:8. There are 144 more story books than literature and art books. How many books are there in each of the three categories?
144÷[2
5-（1-2
5-2
5×7
8）]
=144÷[2
5-1
4]
=144÷3
Twenty
=960 (copy)
960×2
5 = 384
384×7
8 = 336
384-144 = 240
A: there are 384 story books, 336 science and technology books and 240 literature and art books
The library bought 1620 books, one third of which are story books, the rest are literature and technology books. The ratio of literature and art books to science and technology books is 3:2. How many books are there in each of the three categories?
Story books 540. Literature and art 648. Science and technology 432
There are as many science and technology books as literature and art books in the library. The ratio of literature and art books to story books is 3:2. There are 1200 books in three kinds of books. How many books are there in each?
Science and technology: literature and Art: story = 3:3:2
1200 / (3 + 3 + 2) = 150
150 * 3 = 450 Technology
150 * 3 = 450 (undergraduate) literature and art
150 * 2 = 300 stories
There are 12000 science and technology books, literature and art books and story books in the school library, of which science and technology books account for 1 / 3 There are 12000 science and technology books, literature and art books and story books in the school library, of which science and technology books account for 1 / 3. The ratio of science and technology books to story books is two to three. How many story books are there? Fast Process, please
6000 story books
4000 science and technology books
2000 literary and art books
There are 1200 science and technology books, story books and art books in the library, of which the pens of science and technology books and story books are 5:2 And 2:3, respectively
Because 5 ∶ 2 = 15 ∶ 6, 2 ∶ 3 = 4 ∶ 6, the ratio of the three kinds of books is 15 ∶ 6 ∶ 4
So the science and technology book is 1200 × 15 / (15 + 6 + 4) = 720 (copies)
Story book: 1200 × 6 / (15 + 6 + 4) = 288 (copies)
Literature and art books 1200 × 4 / (15 + 6 + 4) = 192 (copies)
There are three kinds of books in the Library: story books, science and technology books, and literature and art books. The number of story books accounts for two fifths of the total number, and the number of science and technology books is one fourth of literature and art books Literature and art books are 20 less than story books. How many books are there in the library
Story books account for two fifths of the total, so science and technology books and literature and art books account for three fifths of the total, and science and technology books are a few quarters of literature and art. If it is three quarters (one fourth can't be counted), literature and art books are 35 / 12 of the total, and literature and art books are 20 less than story books. The sum of literature and art books plus 20 is equal to story books, and the total number can be 350
There are 12000 science and technology books, literature and art books and story books in the school library, of which science and technology books account for one fifth. The ratio of science and technology books to story books is 2:3. How many story books are there?
Science and technology books: 12000x5 = 2400
The story book is: 2400x3 △ 2 = 3600
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