Question

За три дня Ваня прочитал 128 страниц книги. В первый день он прочитал на 38 страниц меньше чем во второй, а за третий деньна 25 страниц больше чем за второй. Сколько страниц читал Ваня в каждый из дней?

Answer 1

Я решил в виде уравнения
х-38+х+х+25=128
3х-38+25=128
3х-38=103
3х=141
х=47 (2 день)
47-38=9 (1 день)
47+25=72 (3 день)

Answer 2

Problem Analysis

We are given that Vanya read 128 pages of a book over three days. On the first day, he read 38 pages less than on the second day, and on the third day, he read 25 pages more than on the second day. We need to determine how many pages Vanya read each day.

Solution

Let's assume that Vanya read x pages on the second day.

According to the given information: - On the first day, Vanya read 38 pages less than on the second day, so he read (x - 38) pages. - On the third day, Vanya read 25 pages more than on the second day, so he read (x + 25) pages.

The total number of pages Vanya read over the three days is 128. Therefore, we can write the equation:

(x - 38) + x + (x + 25) = 128

Simplifying the equation: 3x - 13 = 128 3x = 141 x = 47

So, Vanya read 47 pages on the second day.

Now, we can calculate the number of pages Vanya read on the first and third days: - On the first day: (x - 38) = (47 - 38) = 9 pages - On the third day: (x + 25) = (47 + 25) = 72 pages

Therefore, Vanya read 9 pages on the first day and 72 pages on the third day.

Answer

Vanya read 9 pages on the first day, 47 pages on the second day, and 72 pages on the third day.