Question

№142Реши задачу, не вычисляя цены электропровода. Вычисли и запиши ответ.За 20 м электропровода покупатель заплатил 160 руб. Сколько нужно заплатить за 100 м такого е провода?Помогите пожалуйста!

Answer 1

160*100/20
Ответ: 800 рублей

Answer 2

Problem Analysis

To solve this problem, we need to find the cost of 100 meters of the same type of electrical wire, given that the cost of 20 meters is 160 rubles. We can use a proportion to find the answer.

Solution

Let's set up a proportion to solve the problem:

20 meters is to 160 rubles as 100 meters is to x rubles

We can solve this proportion by cross-multiplying and then dividing:

20 * x = 160 * 100

To find the value of x, we divide both sides of the equation by 20:

x = (160 * 100) / 20

Now we can calculate the value of x:

x = 800 rubles

Therefore, the cost of 100 meters of the same type of electrical wire is 800 rubles.

Answer

The cost of 100 meters of the same type of electrical wire is 800 rubles.