Question

на трёх аллеях парка посадили 80 деревьев.на первой аллее посадили на 20 деревьев больше чем на второй,а на второй на 15 деревьев меньше чем на третьей. сколько деревьев посадили на каждой аллее

Answer 1

1) х+20+х+х-15=80
  3х+20-15=80
  3х=80-20+15
  3х=75
  х=75:3
  х=25 деревьев посадили на второй аллеи
2) 25+20=45 деревьев посадили на первой аллеи
3) 25-15=10 деревьев посадили на третьей аллеи 

Answer 2

Problem Analysis

We are given that 80 trees were planted across 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 fewer 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 fewer than the number planted on the third alley, so it is x - 15. - The number of trees planted on the first, second, and third alleys sum up to 80, so we have the equation: (x + 20) + x + (x - 15) = 80.

Now, let's solve this equation to find the value of x and then calculate the number of trees planted on each alley.

Calculation

Simplifying the equation: 3x + 5 = 80 3x = 75 x = 25

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

Using this value, we can calculate 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.

Answer

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

Please let me know if there is anything else I can help you with!