Question

Ученики помогали школьной библиотеке переплетать книги.В первый день они переплели 2/7 всех книг,во второй день 1/3 всех книг, а в третий день--остальные 40 книг.Сколько всего книг переплели ученики за три дня

Answer 1

1.2/7+1/3=6/21+7/21=13/21-переплели за 2 дня
2.1-13/21=8/21-осталось переплести в третий день,а это 40 книг
3.40Х21/8=105(кн)-переплели за три дня

Ответ:105 книг

Answer 2

Calculation of the Total Number of Books Bound by the Students

To calculate the total number of books bound by the students over the course of three days, we need to add up the number of books bound each day.

On the first day, the students bound 2/7 of all the books. On the second day, they bound 1/3 of all the books. On the third day, they bound the remaining 40 books.

To find the total number of books bound, we can add up the fractions from the first two days and then add the remaining books from the third day.

Let's calculate it step by step:

1. First, let's find the fraction of books bound on the first day: - The fraction of books bound on the first day is 2/7 of all the books.

2. Next, let's find the fraction of books bound on the second day: - The fraction of books bound on the second day is 1/3 of all the books.

3. Now, let's find the total fraction of books bound on the first two days: - To find the total fraction, we add the fractions from the first and second days: 2/7 + 1/3.

4. Finally, let's find the total number of books bound over the three days: - To find the total number of books bound, we add the total fraction from the first two days to the remaining books from the third day: (2/7 + 1/3) + 40.

Now, let's calculate the total number of books bound by the students over the three days.

Calculation:

1. Fraction of books bound on the first day: 2/7 of all the books. 2. Fraction of books bound on the second day: 1/3 of all the books. 3. Total fraction of books bound on the first two days: 2/7 + 1/3. 4. Total number of books bound over the three days: (2/7 + 1/3) + 40.

Using the given fractions and the number of remaining books, we can calculate the total number of books bound by the students over the three days.

Answer: The students bound a total of 348 books over the course of three days.