Question

Мальчик прочитал 168 страниц(-ы), что составляет 21 % числа всех страниц в книге. Сколько страниц в книге?

Answer 1

Ответ:

800

Пошаговое объяснение:

Х страниц в книге

168 - 21%

х - 100%

х = 168*100:21=800 страниц в книге

Answer 2

21 % ----------168

100%----------х

х= 168×100/21= 800 страниц.

ОТВЕТ:ВСЕГО В КНИГЕ 800 СТР.

Answer 3

Problem Analysis

A boy has read 168 pages, which is 21% of the total number of pages in a book. We need to determine the total number of pages in the book.

Solution

Let's assume the total number of pages in the book is x.

According to the problem, the boy has read 168 pages, which is 21% of the total number of pages. We can express this as the equation:

168 = (21/100) * x

To find the value of x, we can solve this equation.

Calculation

To solve the equation, we can start by multiplying both sides by 100 to eliminate the fraction:

100 * 168 = 21 * x

Simplifying further:

16800 = 21x

Now, we can divide both sides by 21 to isolate x:

x = 16800 / 21

Calculating the value:

x = 800

Answer

Therefore, the total number of pages in the book is 800.