Question

В магазине в первый день продано 53% всех учебников,после обеда-40% всех учебников. а перед закрытием магазина-остальные 847 учебников. Сколько учебников было продано за день?

Answer 1

найдем долю последних учебников

100%-53%-40%=7%

Теперь находим целое от части, то есть общий объем продажи за весь день

847÷7%×100%=12100 учебников

Ответ:12100 учебников

Answer 2

Calculation of the Number of Textbooks Sold

To calculate the number of textbooks sold in the store, we need to follow the given information step by step.

1. First, we are told that on the first day, 53% of all textbooks were sold. 2. Then, after lunch, an additional 40% of all textbooks were sold. 3. Finally, before closing, the remaining 847 textbooks were sold.

To find the total number of textbooks sold, we can work backwards from the remaining 847 textbooks.

Let's denote the total number of textbooks as "x".

- After lunch, 40% of all textbooks were sold, which means 60% (100% - 40%) of the textbooks remained. So, 60% of x is equal to the remaining 847 textbooks. - Mathematically, this can be expressed as: 0.6x = 847.

To find the value of x, we can divide both sides of the equation by 0.6: - x = 847 / 0.6.

Now, we can calculate the value of x to find the total number of textbooks sold.

Calculating x: - x = 847 / 0.6 = 1411.67.

Since we cannot have a fraction of a textbook, we can round the value of x to the nearest whole number: - x ≈ 1412.

Therefore, approximately 1412 textbooks were sold on the first day.

Please note that this calculation assumes that the percentage values provided are accurate and that there were no additional factors affecting the number of textbooks sold.