Question

Экскаватор, вырыл траншею длиной 150 м за 3 дня. За первый день он, вырыл 40 % траншеи, а за второй 5/9 той части, которая осталась. Сколько метров траншеи, вырыл экскаватор за третий день?

Answer 1

За первый день он вырыл 0,4*150=60 м
На второй день (150-60)*5/9=50м
Осталось вырыть 40 м
Ответ: 40м  вырыл экскаватор за  третий день

Answer 2

Calculation of Excavator's Progress

To calculate the length of the trench dug by the excavator on the third day, we need to determine the length of the trench remaining after the first and second days.

1. On the first day, the excavator dug 40% of the trench. Let's calculate this: - Length of the trench: 150 m - Length dug on the first day: 40% of 150 m = 60 m.

2. On the second day, the excavator dug 5/9 of the remaining trench. To find the remaining trench length, we subtract the length dug on the first day from the total trench length: - Remaining trench length after the first day: 150 m - 60 m = 90 m. - Length dug on the second day: (5/9) * 90 m = 50 m.

3. Now, to find the length of the trench dug on the third day, we subtract the lengths dug on the first and second days from the total trench length: - Remaining trench length after the second day: 90 m - 50 m = 40 m. - Length dug on the third day: 40 m.

Therefore, the excavator dug a length of 40 meters on the third day.

Please note that the calculations are based on the given information and assumptions made.