Question

В парке дети катались на четырехколесных и на шестиколёсных электромобилях . Всего было 36 электромобилей а у них 174 колёса .Сколько четырёхколёсных и сколько шестиколёсных электромобилей.

Answer 1

1) 21×4=84÷4=21  четырехколесных эл.моб.
2) 15×6=90÷6=15  шестиколесных эл.моб.
3) 21+15=36 электромобилей

Answer 2

Problem Analysis

We are given that there were a total of 36 electric cars in the park, and these cars had a total of 174 wheels. We need to determine the number of four-wheeled and six-wheeled electric cars.

Solution

Let's assume the number of four-wheeled electric cars is represented by x, and the number of six-wheeled electric cars is represented by y.

From the given information, we can form the following equations:

1. The total number of electric cars: x + y = 36 (equation 1) 2. The total number of wheels: 4x + 6y = 174 (equation 2)

To solve this system of equations, we can use the method of substitution or elimination. Let's use the method of substitution.

From equation 1, we can express x in terms of y as follows:

x = 36 - y (equation 3)

Substituting equation 3 into equation 2, we get:

4(36 - y) + 6y = 174

Simplifying the equation:

144 - 4y + 6y = 174

Combining like terms:

2y = 30

Dividing both sides by 2:

y = 15

Substituting the value of y back into equation 1, we can find the value of x:

x + 15 = 36

x = 36 - 15

x = 21

Therefore, there are 21 four-wheeled electric cars and 15 six-wheeled electric cars in the park.

Answer

There are 21 four-wheeled electric cars and 15 six-wheeled electric cars in the park.