Question

В библиотеке 3200 книг. Из них 40 % книг в твёрдом переплёте , в мягком переплёте 115 % от книг в твёрдом переплёте , остальные - в электронном виде . сколько книг в электронном виде ( с краткрой запесью)

Answer 1

всего3200книг=100%

в тверд-40%

в мягком-115% от книг в тверд

в электрон-остальные

1)3200/100*40=1280книг-в твердом переплете

1280к=100%

Х книг=115%

2)1280/100*115=1472книги-в мягком переплете

3)3200-(1472+1280)=448книг-электронных

ответ:электронных 448 книг

Answer 2

Calculating the Number of E-books in the Library

To calculate the number of e-books in the library, we can use the information provided about the total number of books and the distribution of books in different formats.

Given: - Total number of books in the library: 3200 - Number of books in hardcover: 40% of 3200 - Number of books in softcover: 115% of the number of books in hardcover - Remaining books are in electronic format

Let's calculate the number of e-books in the library.

Calculation

1. Number of books in hardcover: 40% of 3200 2. Number of books in softcover: 115% of the number of books in hardcover 3. Number of e-books: Total books - (hardcover books + softcover books)

Solution

1. Number of books in hardcover: 40% of 3200 - 40% of 3200 = 0.40 * 3200 = 1280 books 2. Number of books in softcover: 115% of the number of books in hardcover - 115% of 1280 = 1.15 * 1280 = 1472 books 3. Number of e-books: Total books - (hardcover books + softcover books) - Total books = 3200 - Number of e-books = 3200 - (1280 + 1472) = 3200 - 2752 = 448 books

Answer

The library has 448 books in electronic format.