Question

В городском парке до обеда было продано 2/9 всех воздушных шариков, после обеда ещё 38 штук.После этого осталась треть всех шариков, приготовлнных для продажи.Солько шариков было первоначально?

Answer 1

1)   2/9+1/3=5/9(части) - продали до обеда и осталось
2)   1 - 5/9=4/9(части) - продали после обеда, что равно 36 шар.
3)   36*9:4=81(шар.) - было всего

Answer 2

Calculation of the Initial Number of Balloons

To determine the initial number of balloons, we can use the information provided in the question. Let's break down the given information step by step:

1. "In the city park, 2/9 of all the balloons were sold before lunch." 2. "After lunch, an additional 38 balloons were sold." 3. "After this, one-third of all the balloons prepared for sale remained."

Let's calculate the initial number of balloons using this information.

Step 1: Calculate the number of balloons sold before lunch. - The question states that 2/9 of all the balloons were sold before lunch. - Let's assume the total number of balloons initially prepared for sale is represented by "x". - Therefore, the number of balloons sold before lunch can be calculated as (2/9) * x.

Step 2: Calculate the number of balloons sold after lunch. - The question states that an additional 38 balloons were sold after lunch.

Step 3: Calculate the number of balloons remaining after lunch. - The question states that one-third of all the balloons prepared for sale remained. - Therefore, the number of balloons remaining after lunch can be calculated as (1/3) * x.

Now, we can set up an equation to solve for the initial number of balloons, "x".

Equation: (2/9) * x + 38 = (1/3) * x

To solve this equation, we can multiply both sides by 9 to eliminate the fractions:

9 * (2/9) * x + 9 * 38 = 9 * (1/3) * x

2x + 342 = 3x

Subtracting 2x from both sides:

342 = x

Therefore, the initial number of balloons was 342.

Please let me know if you have any further questions!

Answer 3

Я могу помочь вам решить эту задачу. Вот мои шаги:

1. Пусть x - это количество воздушных шариков, приготовленных для продажи. 2. До обеда было продано 2/9 от x, то есть (2/9)x. 3. После обеда было продано ещё 38 штук, то есть (2/9)x + 38. 4. После этого осталась треть от x, то есть (1/3)x. 5. Составим уравнение: (2/9)x + 38 = (2/3)x. 6. Решим уравнение: (2/9)x + 38 = (2/3)x <=> (2/9)x - (2/3)x = -38 <=> -(4/9)x = -38 <=> x = (-38) / (-4/9) <=> x = 85.5. 7. Ответ: первоначально было 85.5 воздушных шариков.