Question

В первый день мальчик прочитал 25% книги во второй-2/3 книги а в третий-осталось 17 страниц. Сколько страниц в книге?

Answer 1

Х-количество страниц
1/4х - за первый день,  в итоге осталось 3/4 книги
3/4*2/3х-за 2 день
17-за третий день
Итого имеем: х=1/4х+(3/4*2/3х)+17
Отсюда следует, что х=68

Answer 2

Х страниц в книге
25%=0.25=1/4
1/4х стр в 1 день
2/3х стр во 2 день

1/4х+2/3х+17=х
х-1/4х-2/3х=17
12/12х-3/12х-8/12х=17
1/12х=17
х=12×17
х=204 страницы всего

Answer 3

Calculating the Number of Pages in the Book

To calculate the number of pages in the book, we can use the information provided about the percentage of the book read on each day.

1. First Day: 25% of the Book Read 2. Second Day: 2/3 of the Book Read 3. Third Day: 17 Pages Left

Let's calculate the number of pages in the book using this information.

Calculation

1. On the first day, the boy read 25% of the book. 2. On the second day, he read 2/3 of the book. 3. On the third day, he had 17 pages left.

Let's denote the total number of pages in the book as x.

According to the given information, we can form the following equations:

1. 25% of x = pages read on the first day 2. 2/3 of x = pages read on the second day 3. x - 17 = pages left on the third day

We can use these equations to solve for the total number of pages in the book.

Solution

1. 25% of x = pages read on the first day - 0.25x

2. 2/3 of x = pages read on the second day - (2/3)x

3. x - 17 = pages left on the third day

We can set up the following equation using the given information: - 0.25x + (2/3)x + 17 = x

Solving for x: - 0.25x + (2/3)x + 17 = x - 0.25x + 0.67x + 17 = x - 0.92x + 17 = x - 17 = x - 0.92x - 17 = 0.08x - x = 17 / 0.08 - x = 212.5

Answer

The total number of pages in the book is 212.5.