Question

Яблуні становлять 40 % усіх дерев саду, вишні 80 % кількості аб лунь, а решта 21 дерево в саду — груші. Скільки всього дерев у саду?

Answer 1

Ответ:   х = 75 дерев .

Пошаговое объяснение:

Нехай в саду  всіх дерев х , тоді яблунь було 0,4х дерев , а вишень

0,8*( 0,4х) дерев .

х - ( 0,4х + 0,32х ) = 21 ;

х - 0,72х = 21 ;

0,28х = 21 ;

       х = 21 : 0,28 ;

       х = 75 .

Answer 2

Calculating the Total Number of Trees in the Garden

To calculate the total number of trees in the garden, we can use the information provided about the percentages of different types of trees.

Let's denote the total number of trees in the garden as T.

According to the given information: - Apples make up 40% of all the trees. - Cherries make up 80% of the remaining trees after accounting for apples. - The rest, 21 trees, are pears.

We can use this information to set up an equation to find the total number of trees in the garden.

First, we calculate the number of cherry trees: Cherry trees = 80% of (100% - 40%) of T.

Then, we calculate the number of apple trees: Apple trees = 40% of T.

Finally, we can find the total number of trees in the garden: Total trees = Apple trees + Cherry trees + 21 (pears).

Let's calculate the total number of trees using the given percentages and the number of pear trees.

Cherry trees = 80% of (100% - 40%) of T = 0.8 * 60% * T = 0.48 T.

Apple trees = 40% of T = 0.4 T.

Total trees = Apple trees + Cherry trees + 21 = 0.4 T + 0.48 T + 21 = 0.88 T + 21.

Now, we can solve for T: 0.88 T + 21 = T.

Subtracting 0.88 T from both sides: 21 = 0.12 T.

Finally, solving for T: T = 21 / 0.12 = 175.

So, the total number of trees in the garden is 175.