Question

Решите задачу: всего в библиотеке 4240 книг художественные-20% от всех книг , справочники составляют 3/4 от художественных остальные учебники . Найти количество учебников в библиотеке

Answer 1

Найдем количество худ. книг
4240:100*20=848 книг
найдем количество справочников
848*3/4=636 книг
найдем количество учебников
4240-848-636=2756 книг

Answer 2

Problem Analysis

To solve this problem, we need to find the number of textbooks in the library given the total number of books and the percentages of different types of books. Let's break down the information provided:

- Total number of books in the library: 4240 - Fiction books make up 20% of all books. - Reference books make up 3/4 (or 75%) of the fiction books. - The remaining books are textbooks.

Solution

To find the number of textbooks, we can follow these steps:

1. Calculate the number of fiction books in the library by multiplying the total number of books by 20%: 4240 * 20% = 848. 2. Calculate the number of reference books by multiplying the number of fiction books by 75%: 848 * 75% = 636. 3. Subtract the number of reference books from the number of fiction books to find the number of textbooks: 848 - 636 = 212.

Therefore, there are 212 textbooks in the library.

Answer

The number of textbooks in the library is 212.

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