Question

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

Answer 1

На третьей аллее - х
на второй аллее - х-15
на первой аллее - (х-15)+20
всего - 80

х+х-15+х-15+20=80
3х-10=80
3х=90
х=30

на третьей аллее - 30
на второй аллее - 30-15=15
на первой аллее - (30-15)+20=35
всего - 80

Answer 2

Problem Analysis

We are given the information that 80 trees were planted in a park, and the number of trees planted on each alley is related to the number of trees planted on the other alleys. Specifically, on the first alley, 20 more trees were planted than on the second alley, and on the second alley, 15 fewer trees were planted than 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 on the second alley, so it is x + 20. - The number of trees planted on the third alley is 15 more than on the second alley, so it is x + 15.

We know that the total number of trees planted is 80, so we can write the equation:

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

Simplifying the equation:

3x + 35 = 80

Subtracting 35 from both sides:

3x = 45

Dividing both sides by 3:

x = 15

Therefore, the number of trees planted on the second alley is 15.

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 = 15 + 20 = 35. - The number of trees planted on the third alley is x + 15 = 15 + 15 = 30.

So, the number of trees planted on each alley is as follows: - First alley: 35 trees - Second alley: 15 trees - Third alley: 30 trees

Answer

The number of trees planted on each alley is as follows: - First alley: 35 trees - Second alley: 15 trees - Third alley: 30 trees