Question

На трех аллеях парка посадил 80 деревьев. На первой аллее посадили на 20 деревьев больше, чем на второй, а навторой на 15 деревьев меньше чем на третьей . Сколько деревьев посадили на каждой аллее?

Answer 1

80-20-15=45 (д.)
45:3=15 (д.)
15+20=35
15+15=30
Проверка:
35+30+15=80
Ответ:15;30;35.

Answer 2

Problem Analysis

We are given that a total of 80 trees were planted on three alleys in a park. The number of trees planted on the first alley is 20 more than the number planted on the second alley, and the number planted on the second alley is 15 less than the number planted on the third alley. We need to determine the number of trees planted on each alley.

Solution

Let's assume the number of trees planted on the second alley is x.

According to the given information: - The number of trees planted on the first alley is 20 more than the number planted on the second alley, so it is x + 20. - The number of trees planted on the second alley is 15 less than the number planted on the third alley, so it is x - 15.

The total number of trees planted on all three alleys is 80, so we can write the equation:

x + (x + 20) + (x - 15) = 80

Simplifying the equation:

3x + 5 = 80

Subtracting 5 from both sides:

3x = 75

Dividing both sides by 3:

x = 25

Therefore, the number of trees planted on the second alley is 25.

Using this information, we can find the number of trees planted on the first and third alleys:

- The number of trees planted on the first alley is x + 20 = 25 + 20 = 45. - The number of trees planted on the third alley is x - 15 = 25 - 15 = 10.

So, the number of trees planted on each alley is as follows: - First alley: 45 trees - Second alley: 25 trees - Third alley: 10 trees

Answer

The number of trees planted on each alley is as follows: - First alley: 45 trees - Second alley: 25 trees - Third alley: 10 trees