Question

Помогите пожалуйста решить задачу. Коля узнал, что 45 больших деревьев, растущих в лесу вокруг тур-базы ,выделяют в сутки столько кислорода, сколько его нужно для дыхания 90 третьеклассников. В большом городе в воздухе много загрязняющих его газов , и эти же деревья выделяют там в 10 раз меньше кислорода. Сколько таких деревьев надо посадить Коле и его друзьям во дворе московской школы , чтобы они выделяли в сутки такое количество кислорода, которого хватило бы для дыхания 25 учеников Колиного класса?

Answer 1

1) 45/90=1/2 дерева нужна для дыхания одного третьеклассника вокруг турбазы2) 1/2 *25=12,5 деревьев нужно для дыхания 25 третьеклассников не турбазе3) 12,5*10=125 деревьев нужно в городе для дыхания 25 третьеклассниов.
всё

Answer 2

Problem Analysis

To solve this problem, we need to determine the number of trees that need to be planted in the Moscow schoolyard in order to produce enough oxygen for 25 students in Colin's class. We are given that 45 large trees in the forest around the tourist base produce enough oxygen for 90 third-grade students. In the city, these same trees produce 10 times less oxygen due to air pollution from gases.

Solution

Let's break down the problem step by step:

1. Determine the amount of oxygen produced by the 45 trees in the forest around the tourist base. 2. Calculate the amount of oxygen needed for 90 third-grade students. 3. Determine the amount of oxygen produced by the same trees in the city. 4. Calculate the amount of oxygen needed for 25 students in Colin's class. 5. Calculate the number of trees needed to produce the required amount of oxygen for Colin's class.

Step 1: Determine the amount of oxygen produced by the 45 trees in the forest around the tourist base.

According to the problem, the 45 large trees in the forest around the tourist base produce enough oxygen for 90 third-grade students.

Step 2: Calculate the amount of oxygen needed for 90 third-grade students.

We are given that the 45 trees produce enough oxygen for 90 third-grade students. Therefore, we can assume that each tree produces enough oxygen for 2 third-grade students.

Step 3: Determine the amount of oxygen produced by the same trees in the city.

In the city, the same trees produce 10 times less oxygen due to air pollution from gases.

Step 4: Calculate the amount of oxygen needed for 25 students in Colin's class.

We need to calculate the amount of oxygen needed for 25 students in Colin's class. Since each tree produces enough oxygen for 2 third-grade students, we can calculate the number of trees needed by dividing the number of students by 2.

Step 5: Calculate the number of trees needed to produce the required amount of oxygen for Colin's class.

To calculate the number of trees needed, we divide the number of students by the number of students each tree can support.

Let's calculate the number of trees needed:

Number of trees needed = Number of students / Number of students each tree can support

Number of trees needed = 25 / 2

Number of trees needed = 12.5

Since we cannot have a fraction of a tree, we need to round up to the nearest whole number. Therefore, Kolya and his friends need to plant 13 trees in the Moscow schoolyard to produce enough oxygen for 25 students in Colin's class.

Answer

Kolya and his friends need to plant 13 trees in the Moscow schoolyard to produce enough oxygen for 25 students in Colin's class.