Question

Школьники помогали лесникам высаживать саженцы елей и сосен. Ели высаживали 75% ребят, а сосны высаживали 80% учеников Сколько процентов учеников высаживали и сосны и ели ?

Answer 1

Ответ:

составим и решим уравнение для двух множеств

всего было х детей

х = 0.75х+0.8х-y

где 0.75х это высаживали Ели

0.8х это высаживалт сосны

у это те кто делал и то и другое

у = 0.55х

Ответ 55%

Answer 2

Составим и решим Уравнение для двух множеств:
Всего было x детей
X=0.75x+0.8x-y
0.75x-высаживали елей.
0.8x-высаживали сосны.
y-другое
y=0.55x
Ответ :55%

Answer 3

Calculation of the Percentage of Students Planting Both Fir and Pine Trees

To calculate the percentage of students who planted both fir and pine trees, we need to find the intersection of the two groups.

Let's assume there are 100 students in total.

According to the information given, 75% of the students planted fir trees, and 80% of the students planted pine trees.

To find the percentage of students who planted both types of trees, we need to find the intersection of the two percentages.

The formula for finding the intersection of two percentages is:

Intersection = Percentage A + Percentage B - (Percentage A * Percentage B)

Using this formula, we can calculate the percentage of students who planted both fir and pine trees:

Intersection = 75% + 80% - (75% * 80%)

Calculating this equation, we find:

Intersection = 155% - 60%

Intersection = 95%

Therefore, 95% of the students planted both fir and pine trees.

Please note that the given information does not specify the total number of students or provide any additional details. The calculation assumes a total of 100 students for simplicity.