Question

Помогите пожалуйста решить задачу НА НАХОЖДЕНИЕ ЧАСТИ. Девочка читала книгу в 120 страниц.Она начала ее читать утром.После обеда девочка прочитала еще 15 страниц.Затем ей осталось прочитать в 2 раза больше,чем она прочитала.Сколько страниц девочка прочитала утром?

Answer 1

120-15=105 - стр было, до того как она прочитала 15 стр.
105:3=35 страниц прочитала утром.
Ответ: 35 страниц.
Проверим: 120-35 (утром) -15 (обед)=70
70 в два раза больше!

Answer 2

120- 15=105;
105:3=35

Answer 3

Problem Analysis

To solve this problem, we need to determine how many pages the girl read in the morning. We are given that she read a total of 120 pages, read an additional 15 pages after lunch, and has twice as many pages left to read as she has already read.

Solution

Let's assume that the number of pages the girl read in the morning is represented by the variable x.

1. The girl read a total of 120 pages. 2. After lunch, she read an additional 15 pages. 3. She has twice as many pages left to read as she has already read.

Based on these conditions, we can set up the following equation:

x + 15 + 2x = 120

Simplifying the equation:

3x + 15 = 120

Subtracting 15 from both sides:

3x = 105

Dividing both sides by 3:

x = 35

Therefore, the girl read 35 pages in the morning.

Answer

The girl read 35 pages in the morning.

Explanation

To solve this problem, we set up an equation based on the given conditions and solved for the number of pages the girl read in the morning. By substituting the value of x back into the equation, we can verify that it satisfies all the given conditions.