Question

Три группы школьников посадили деревья.Первая группа посадила 35% всех имевшихся деревьев,вторая группа 60% оставшихся деревьев,а третья группа-остальные 104 дерева.Сколько всего деревьев посадили?

Answer 1

Пусть х(деревьев)-было всего, тогда 1 группа посадила 0,35х(деревьев), после чего осалось 0,65х(деревьев). по условию 2 группа посадила 60% оставшихся деревьев, а это 3/5 остатка, значит 2 группа посадила 0,65х:5*3(деревьев), т.е. 0,39х(деревьев), а 3 группа по условию поадила 104(деревьев). Теперь составляем уравнение и решаем его:

х=104+0,39х+0,35х,

х-0,39х-0,35х=104,

0,26х=104,

х=104:0,26

х=400

 Вот и всё решение.

400(деревьев)-посадили всего.

ответ: 400 деревьев

Answer 2

Пусть х(дер)-было всего, тогда 1 группа посадила 0,35х(дер), после чего осалось 0,65х(дер). по условию 2 группа посадила 60% оставшихся деревьев, а это 3/5 остатка, значит 2 группа посадила 0,65х:5*3(дер), т.е. 0,39х(дер), а 3 группа по условию поадила 104(дер). Составим и решим уравнение:

х=104+0,39х+0,35х,

х-0,39х-0,35х=104,

0,26х=104,

х=104:0,26

х=400

 

400(дер)-посадили всего.

ответ: 400 деревьев

Answer 3

Calculating the Total Number of Trees Planted

To calculate the total number of trees planted by the three groups of schoolchildren, we can follow these steps:

1. Calculate the number of trees planted by the first group, which planted 35% of all the existing trees. 2. Calculate the number of trees remaining after the first group planted their share. 3. Calculate the number of trees planted by the second group, which planted 60% of the remaining trees. 4. Calculate the number of trees remaining after the second group planted their share. 5. The third group planted the remaining 104 trees.

Let's proceed with the calculations.

Step 1: Calculate the Number of Trees Planted by the First Group

The first group planted 35% of all the existing trees.

Number of trees planted by the first group = 35% of total number of trees

Step 2: Calculate the Number of Trees Remaining After the First Group Planted

The remaining trees after the first group planted their share can be calculated as follows:

Number of trees remaining = Total number of trees - Number of trees planted by the first group

Step 3: Calculate the Number of Trees Planted by the Second Group

The second group planted 60% of the remaining trees.

Number of trees planted by the second group = 60% of the number of trees remaining after the first group planted

Step 4: Calculate the Number of Trees Remaining After the Second Group Planted

The remaining trees after the second group planted their share can be calculated as follows:

Number of trees remaining = Number of trees remaining after the first group planted - Number of trees planted by the second group

Step 5: Calculate the Total Number of Trees Planted

The third group planted the remaining 104 trees.

Total number of trees planted = Number of trees planted by the first group + Number of trees planted by the second group + Number of trees planted by the third group

Let's perform the calculations based on the given percentages and the number of trees planted by the third group.