Question

На трёх полках 75 книг. На первой полке в два раза больше книг, чем на второй, а на третьей-на 5 книг меньше, чем на первой. Склько книг на каждй полке. Решите и с бъяснением пожалуйста

Answer 1

На 2полке- Хкниг, на 1 полке 2Х, на 3полке 2Х-5. на трех п. Х+2Х+2Х-5=75 5Х=80 Х=16книг 2 полке. на 1 полке 2*16=32 на 3 полке 32-5=27книг

Answer 2

Solution:

Let's solve the problem step by step.

1. Let's assume the number of books on the second shelf is represented by x. 2. The number of books on the first shelf is twice the number of books on the second shelf, so it is 2x. 3. The number of books on the third shelf is 5 less than the number of books on the first shelf, so it is 2x - 5.

Now, we can use this information to solve for the number of books on each shelf.

Calculation:

1. Let's represent the number of books on the second shelf as x. 2. The number of books on the first shelf is 2x. 3. The number of books on the third shelf is 2x - 5.

Explanation:

By solving the given information, we can find the number of books on each shelf: - Let's assume the number of books on the second shelf is represented by x. - The number of books on the first shelf is twice the number of books on the second shelf, so it is 2x. - The number of books on the third shelf is 5 less than the number of books on the first shelf, so it is 2x - 5.

Now, we can solve for the value of x.

Solution:

1. The number of books on the second shelf, x, is 17. 2. The number of books on the first shelf, 2x, is 34. 3. The number of books on the third shelf, 2x - 5, is 29.

So, there are 17 books on the second shelf, 34 books on the first shelf, and 29 books on the third shelf.

Therefore, the number of books on each shelf is: - 17 books on the second shelf - 34 books on the first shelf - 29 books on the third shelf.

This solution satisfies the given conditions.