Question

Первая бригада рабочих может посадить 600 деревьев за 10 дней, вторая - за 15 дней, а третья - за 12 дней. За сколько дней могут посадить эти деревьятри бригады, работая вместе?

Answer 1

1)600:10=60(дер)-за один день 1б
2)600:15=40(дер)-за один день 2б
3)60+40=100(дер)-посадят обе бригады
4)600:100=6(дн)

Answer 2

Первая бригада за 1 день сажает 
600:10=60 дер. 
2 бригада за 1 день сажает 
600:15=40 дер. 
600:12=50 дер.
40+60_50=150 дер за 1 день они посадят вместе 
600: 150=5 дней они посадят все деревья

Answer 3

Problem Analysis

We are given the information that the first team of workers can plant 600 trees in 10 days, the second team can plant 600 trees in 15 days, and the third team can plant 600 trees in 12 days. We need to determine how many days it will take for all three teams to plant the 600 trees together.

Solution

To solve this problem, we can calculate the rate at which each team plants trees and then combine their rates to find the total time required.

Let's denote the rate at which the first team plants trees as R1, the rate at which the second team plants trees as R2, and the rate at which the third team plants trees as R3.

The rate at which each team plants trees can be calculated by dividing the number of trees planted by the number of days taken. Therefore, we have:

- R1 = 600 trees / 10 days - R2 = 600 trees / 15 days - R3 = 600 trees / 12 days

To find the combined rate at which all three teams plant trees, we can add their individual rates:

- Total rate = R1 + R2 + R3

Finally, we can calculate the number of days required for all three teams to plant the 600 trees by dividing the total number of trees by the total rate:

- Total time = 600 trees / Total rate

Let's calculate the values:

R1 = 600 trees / 10 days = 60 trees/day

R2 = 600 trees / 15 days = 40 trees/day

R3 = 600 trees / 12 days = 50 trees/day

Total rate = R1 + R2 + R3 = 60 trees/day + 40 trees/day + 50 trees/day = 150 trees/day

Total time = 600 trees / Total rate = 600 trees / 150 trees/day = 4 days

Therefore, it will take all three teams working together 4 days to plant the 600 trees.

Answer

The three teams can plant the 600 trees together in 4 days.