Question

Оператор набрал текст за три дня . В первый день он набрал 40% всего текста , а во второй день - 21 страницу . В третий день ему осталось набрать 25% текста . Сколько страниц содержит текст?

Answer 1

cтраниц текста х.

В первый день он набрал 0,4х

в третий день 0,25х

х-0,4х-21=0,25х

0,6х-0,25=21

0,35х=21

х=60 страниц

Ответ: 60 страниц

Answer 2

1) 40+25=65 (%) - текста для набора в первый и третий дни

2) 100-65=35 (%) - составляет 21 страница

3) 21:35*100=60 (стр.)

Ответ: текст содержит 60 страниц.

Answer 3

Problem Analysis

We are given that an operator typed a text over the course of three days. On the first day, the operator typed 40% of the total text. On the second day, the operator typed 21 pages. And on the third day, the operator had to type the remaining 25% of the text. We need to determine the total number of pages in the text.

Solution

To find the total number of pages in the text, we can use the information given about the operator's progress on each day.

Let's assume the total number of pages in the text is represented by x.

On the first day, the operator typed 40% of the total text. This can be represented as 40% of x. Therefore, the number of pages typed on the first day is 0.4 x.

On the second day, the operator typed 21 pages. This means the number of pages typed on the second day is 21.

On the third day, the operator had to type the remaining 25% of the text. This can be represented as 25% of x. Therefore, the number of pages typed on the third day is 0.25 x.

To find the total number of pages in the text, we can sum up the number of pages typed on each day and set it equal to x:

0.4 x + 21 + 0.25 x = x

Simplifying the equation:

0.65 x + 21 = x

Rearranging the equation:

0.35 x = 21

Dividing both sides of the equation by 0.35:

x = 21 / 0.35

Calculating the value of x:

x = 60

Therefore, the total number of pages in the text is 60.

Answer

The text contains 60 pages.