Question

В цирке перед началом представления было продано 30% всех воздушных шариков,а в антракте еще 40 штук.После этого осталось 20% количества шариков, приготовленных для продажи.Сколько шариков было приготовлено для продажи?

Answer 1

всего х

продано перед представлением 0,3х

продано в антракте 40

осталось 0,2х

составим уравнение

х=0,3х+0,2х+40

х-0,3х-0,2х=40

0.5х=40

х=40:0,5

х=80 всего шаров приготовили для продажи

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Answer 2

Calculation of the Number of Balloons Prepared for Sale

To calculate the number of balloons that were prepared for sale, we need to follow the information provided in the question.

1. Before the start of the show, 30% of all the balloons were sold. 2. During the intermission, an additional 40 balloons were sold. 3. After these sales, only 20% of the original number of balloons remained.

Let's denote the total number of balloons prepared for sale as 'x'.

According to the information given, we can write the following equation:

x - 30% of x - 40 = 20% of x

To solve this equation, we can follow these steps:

1. Convert the percentages to decimals: - 30% = 0.3 - 20% = 0.2

2. Rewrite the equation using decimals: x - 0.3x - 40 = 0.2x

3. Simplify the equation: 0.5x - 40 = 0.2x

4. Move the terms to one side of the equation: 0.5x - 0.2x = 40

5. Combine like terms: 0.3x = 40

6. Solve for 'x': x = 40 / 0.3

Using a calculator, we can find that x is approximately 133.33.

Therefore, approximately 133 balloons were prepared for sale.

Please note that the exact number of balloons prepared for sale may vary depending on the rounding method used.