Question

На четырех полках было 500 книг на первой полке 139 книг на второй на 12 книг меньше чем на первой А на третьей в 2 раза меньше чем на первой и второй вместе сколько книг было На четырех полках

Answer 1

На первой полке 139
на второй 127
на тре-й 133
на четв-ой 101

Answer 2

Calculating the Total Number of Books on the Four Shelves

To calculate the total number of books on the four shelves, we can use the information provided about the number of books on each shelf.

Let's denote: - The number of books on the first shelf as x - The number of books on the second shelf as (x - 12) - The number of books on the third shelf as (x / 2) - The number of books on the fourth shelf as 500 - x - (x - 12) - (x / 2)

Now, let's calculate the total number of books on the four shelves.

Solution

1. The number of books on the first shelf is x 2. The number of books on the second shelf is (x - 12) 3. The number of books on the third shelf is (x / 2) 4. The number of books on the fourth shelf is 500 - x - (x - 12) - (x / 2)

Using the given information, we can solve for x: - x + (x - 12) + (x / 2) + (500 - x - (x - 12) - (x / 2)) = 500

Solving for x: - x + x - 12 + x/2 + 500 - x - (x - 12) - (x / 2) = 500 - x + x + x - x + x/2 - (x / 2) - 12 + 12 + 500 = 500 - 3x + x/2 - (x / 2) + 500 = 500 - 3x + 500 = 500 - 3x = 0 - x = 0

It seems there might be an error in the given information or calculation. Let's re-evaluate the information and try to solve the problem again.