Question

Маршрут кросса состоит из трёх участков.Длина первого участка в 2 раза больше длины второго,а длина второго-в 3 раза больше длины третьего.Какова длина маршрута? Если: длина первого и второго участков 18 км.

Answer 1

Третий х, второй 3х, первый 2(3х)=6х
6х+3х=18
х=2
х+3х+6х=10х при х=2 даст ответ 20 км

Answer 2

2( 3 х) = 6 х

6х +3 х

х =   9+1   
  
20 

Answer 3

Problem Analysis

We are given a cross-country route consisting of three sections. The length of the first section is twice the length of the second section, and the length of the second section is three times the length of the third section. We need to find the total length of the route.

Solution

Let's assume the length of the third section is x km.

According to the given information: - The length of the second section is 3 times the length of the third section, so it is 3x km. - The length of the first section is twice the length of the second section, so it is 2 * 3x = 6x km.

To find the total length of the route, we need to add the lengths of all three sections: Total length = Length of the first section + Length of the second section + Length of the third section Total length = 6x + 3x + x Total length = 10x

Now, we need to substitute the length of the second and third sections with the given values: - The length of the second section is 18 km, so 3x = 18. - Solving this equation, we find that x = 6 km.

Finally, we can calculate the total length of the route: Total length = 10x = 10 * 6 = 60 km.

Therefore, the total length of the cross-country route is 60 km.

Answer

The total length of the cross-country route is 60 km.