Question

Петрик за 1 день прочитав 1/2 книжки,на 2 день 60% остачі.А на 3 день він прочитав 40 сторінок.Скільки сторінок у книжці?

Answer 1

200 сторiнок
1 день - 50%
2 день - 60% от 50% = 30%
3 день - 40 сторiнок - 20%
=> 1%=2 сторiнках
=> 100%=200 сторiнок

Answer 2

Problem Analysis

We are given the following information about Petrik's reading progress: - On the first day, he read half of the book. - On the second day, he read 60% of the remaining pages. - On the third day, he read 40 pages.

We need to determine the total number of pages in the book.

Solution

Let's assume that the total number of pages in the book is represented by the variable x.

On the first day, Petrik read half of the book, which is equal to x/2 pages.

On the second day, he read 60% of the remaining pages. The remaining pages after the first day's reading are x - (x/2) = x/2 pages. Therefore, on the second day, Petrik read 0.6 * (x/2) = 0.3x pages.

On the third day, Petrik read 40 pages.

To find the total number of pages in the book, we can set up the following equation:

x/2 + 0.3x + 40 = x

Simplifying the equation, we get:

0.8x = 80

Dividing both sides of the equation by 0.8, we find:

x = 100

Therefore, the total number of pages in the book is 100.

Answer

The book has a total of 100 pages.