Question

За три дня турист прошел 90 км. Во второй день он прошел на 10 км меньше, чем в первый день, а третий того, что в первый и во второй день вместе. Сколько километров проходил турист каждый день?

Answer 1

Х - путь пройденный в первый день, x-10 - путь во 2-й день, 2х-10 - в 3-й день

х+х-10+2х-10=90
4х=90+20
4х=110
х=27,5

в первый день пройдено 27,5 км, во второй 27,5-10=17,5 км, в третий день 27,5+17,5=45 км

Answer 2

Problem Analysis

A tourist walked a total of 90 km over three days. On the second day, they walked 10 km less than on the first day, and on the third day, they walked the same distance as the combined distance of the first and second days. We need to determine how many kilometers the tourist walked each day.

Solution

Let's assume the distance the tourist walked on the first day is x km.

According to the problem, the distance walked on the second day is 10 km less than the first day, so it is x - 10 km.

The distance walked on the third day is the sum of the distances walked on the first and second days, so it is x + (x - 10) km.

The total distance walked over the three days is 90 km, so we can write the equation:

x + (x - 10) + (x + (x - 10)) = 90

Simplifying the equation:

4x - 20 = 90

4x = 110

x = 27.5

Therefore, the tourist walked 27.5 km on the first day, 17.5 km on the second day, and 45 km on the third day.

Answer

The tourist walked 27.5 km on the first day, 17.5 km on the second day, and 45 km on the third day.