Question

Лена украсила елку шарами синего и белого цвета, белых шаров было 20, а синих на 5 меньше, чем белых, Сколько всего шаров повесила Лена на елку

Answer 1

1)20-5=15(шар.)-синих
2)20+15=35(шар.)-всего
Ответ:35 шаров повесила Лена на ёлку.

Answer 2

20-5=15 шаров(синих)
20+15=35 шаров(всего)

Answer 3

Calculation of the Total Number of Ornaments

To calculate the total number of ornaments that Lena hung on the Christmas tree, we need to determine the number of white and blue ornaments and then add them together.

Let's denote the number of white ornaments as W and the number of blue ornaments as B.

According to the given information, there were 20 white ornaments, and the number of blue ornaments was 5 less than the number of white ornaments.

We can express this relationship as:

B = W - 5

To find the total number of ornaments, we need to add the number of white and blue ornaments:

Total number of ornaments = W + B

Substituting the value of B from the previous equation, we get:

Total number of ornaments = W + (W - 5)

Simplifying the equation, we have:

Total number of ornaments = 2W - 5

Now, let's calculate the total number of ornaments by substituting the value of W:

Total number of ornaments = 2(20) - 5

Total number of ornaments = 40 - 5

Total number of ornaments = 35

Therefore, Lena hung a total of 35 ornaments on the Christmas tree.