Question

На 2 стеллажах стояло 450 книг. Когда с 1 стеллажа переставили на другой 20 книг. то книг на стеллажах стало поровну.Сколько книг стояло на каждом стеллаже первоначально

Answer 1

450/2=225книг - стало на каждом стелаже

225+20=245книг - было на 1 стелаже

225-20=205книг - было на втором стелаже

Answer 2

Problem Analysis

We are given that there were initially 450 books on two shelves, and when 20 books were moved from one shelf to the other, the number of books on each shelf became equal. We need to determine the number of books that were initially on each shelf.

Solution

Let's assume that the number of books initially on the first shelf is x. Therefore, the number of books initially on the second shelf is 450 - x.

When 20 books are moved from one shelf to the other, the number of books on each shelf becomes equal. This can be expressed as the following equation:

x - 20 = 450 - x + 20

Simplifying the equation:

2x = 450 + 20 + 20

2x = 490

x = 490 / 2

x = 245

Therefore, there were initially 245 books on the first shelf and 450 - 245 = 205 books on the second shelf.

Answer

There were initially 245 books on the first shelf and 205 books on the second shelf.