Question

На верхней и на нижней полках было по 9 книг.с верхней полки 3 книги переставили на нижнюю.сколько книг стало на каждой полке?

Answer 1

На нижней стало: 9+3=12 книг
На верхней: 9-3=6

Answer 2

Calculating the Number of Books on Each Shelf

To solve this problem, we can use a simple algebraic equation. Let's denote the number of books on the top shelf as x and the number of books on the bottom shelf as y. We are given that there were 9 books on each shelf initially, and 3 books were moved from the top shelf to the bottom shelf.

Setting up the Equation

We can set up the equation as follows: x - 3 = y + 3

This equation represents the fact that after moving 3 books from the top shelf to the bottom shelf, the number of books on the top shelf decreased by 3, and the number of books on the bottom shelf increased by 3.

Solving for the Number of Books on Each Shelf

Now, let's solve the equation to find the values of x and y.

x - 3 = y + 3 x - y = 6

This equation tells us that the difference between the number of books on the top shelf and the number of books on the bottom shelf is 6.

Conclusion

Based on the given information and the equation, we can conclude that after moving 3 books from the top shelf to the bottom shelf, there are 6 books on the top shelf and 12 books on the bottom shelf.