Question

Помогите срочно. .. Машина за три дня проехала 690 км, причем , в третий день в 2 раза больше , чем в первый , а во второй - на 60 км меньше, чем в третий. Сколько километров проходила машина каждый день? Напишите решение буду благодарен. . :-)

Answer 1

X - 1 день
2x - 3 день
(2x-60) - 2 день
Уравнение:
x+2x+2x-60=690
5x=750
x=150
150 - 1 день
150x2=300 - 3 день
300-60=240 - 2 день

Answer 2

Problem Analysis

We are given the following information: - The car traveled a total of 690 km in three days. - On the third day, the car traveled twice as much as on the first day. - On the second day, the car traveled 60 km less than on the third day.

We need to find out how many kilometers the car traveled each day.

Solution

Let's assume that the car traveled x km on the first day, y km on the second day, and z km on the third day.

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

1. The car traveled a total of 690 km in three days: x + y + z = 690

2. On the third day, the car traveled twice as much as on the first day: z = 2x

3. On the second day, the car traveled 60 km less than on the third day: y = z - 60

Now, we can solve these equations to find the values of x, y, and z.

Substituting equation 2 into equation 3, we get: y = 2x - 60

Substituting equations 2 and 3 into equation 1, we get: x + (2x - 60) + 2x = 690 5x - 60 = 690 5x = 750 x = 150

Substituting the value of x into equation 2, we get: z = 2(150) z = 300

Substituting the value of z into equation 3, we get: y = 300 - 60 y = 240

Therefore, the car traveled 150 km on the first day, 240 km on the second day, and 300 km on the third day.

Answer

The car traveled 150 km on the first day, 240 km on the second day, and 300 km on the third day.