Question

Яблони составляют 40% всех деревьев сада, вишни - 80% количества яблонь, а остальные деревья в саду-груши, и их 21 дерево. Сколько деревьев в саду?

Answer 1

Х - общее количество деревьев в саду,
0,4х - составляют яблони,
0,8·0,4х=0,32х  - составляют вишни.
0,4х+0,32х+21=х
0,72х-х=-21
-0,28х=-21
х=75 деревьев в саду

Answer 2

0,4x-----яблони
0,4x*0,8=0,32x-----вишни
0,4x+0,32x+21=x
21=x-0,4x-0,32x
21=0,28x
x=21:0,28
x=75 деревьев в саду

Answer 3

Calculation of the Number of Trees in the Garden

To calculate the number of trees in the garden, we can use the given information about the percentages of apple trees, cherry trees, and pear trees.

According to the information provided, apple trees make up 40% of all the trees in the garden, while cherry trees make up 80% of the number of apple trees. The remaining trees in the garden are pear trees, and there are 21 of them.

To find the total number of trees in the garden, we can follow these steps:

1. Calculate the number of apple trees: - Since apple trees make up 40% of all the trees in the garden, we can calculate the number of apple trees by multiplying the total number of trees by 0.4. - Let's assume the total number of trees in the garden is represented by the variable "T". - The number of apple trees would be 0.4 * T.

2. Calculate the number of cherry trees: - Since cherry trees make up 80% of the number of apple trees, we can calculate the number of cherry trees by multiplying the number of apple trees by 0.8. - The number of cherry trees would be 0.8 * (0.4 * T).

3. Calculate the number of pear trees: - The remaining trees in the garden are pear trees, and there are 21 of them.

4. Calculate the total number of trees in the garden: - The total number of trees in the garden would be the sum of the number of apple trees, cherry trees, and pear trees.

Let's calculate the total number of trees in the garden using the given information:

1. Calculate the number of apple trees: - The number of apple trees = 0.4 * T.

2. Calculate the number of cherry trees: - The number of cherry trees = 0.8 * (0.4 * T).

3. Calculate the number of pear trees: - The number of pear trees = 21.

4. Calculate the total number of trees in the garden: - The total number of trees = number of apple trees + number of cherry trees + number of pear trees.

Now, let's substitute the values and calculate the total number of trees in the garden:

- The number of apple trees = 0.4 * T. - The number of cherry trees = 0.8 * (0.4 * T). - The number of pear trees = 21. - The total number of trees = (0.4 * T) + (0.8 * (0.4 * T)) + 21.

Please note that we don't have the exact value of T, the total number of trees in the garden, so we cannot provide an exact numerical answer. However, you can use the given information and the steps provided above to calculate the total number of trees in the garden based on the specific value of T.