Question

Оля прочитала книгу за 3 дня.В первый день она прочитала 18 страниц.Во второй-в 2 раза меньше.Сколько страниц прочитала Оля в третий день,если за три дня она прочитала 60 страниц? Нужно решить в два способа

Answer 1

1)18/2=9(стр)-во 2 день
2)60-(9+18)=33(стр)-в 3 день
Ответ-????

Answer 2

Problem Analysis

To solve this problem, we need to find out how many pages Olga read on the third day, given that she read a total of 60 pages in three days. We are given that on the first day, Olga read 18 pages, and on the second day, she read half as many pages as on the first day. We need to find the number of pages she read on the third day.

Solution 1: Using Algebra

Let's assume that the number of pages Olga read on the third day is x.

According to the given information: - On the first day, Olga read 18 pages. - On the second day, she read half as many pages as on the first day, which is 18/2 = 9 pages. - On the third day, she read x pages.

The total number of pages Olga read in three days is 60 pages.

So, we can write the equation: 18 + 9 + x = 60

Simplifying the equation: 27 + x = 60

Subtracting 27 from both sides: x = 60 - 27 x = 33

Therefore, Olga read 33 pages on the third day.

Solution 2: Using Proportions

We can also solve this problem using proportions.

Let's assume that the number of pages Olga read on the third day is x.

According to the given information: - On the first day, Olga read 18 pages. - On the second day, she read half as many pages as on the first day, which is 9 pages. - On the third day, she read x pages.

To find the value of x, we can set up the following proportion:

(18 + 9 + x) / 3 = 60 / 3

Simplifying the proportion: (27 + x) / 3 = 20

Cross-multiplying: 27 + x = 60

Subtracting 27 from both sides: x = 60 - 27 x = 33

Therefore, Olga read 33 pages on the third day.

Conclusion

In both solutions, we found that Olga read 33 pages on the third day.

Note: The sources provided did not contain relevant information for this specific problem.