Question

Бригада устанавливает входные двери квартир в новом доме.Первая бригада устанавливает в день 25 дверей,а вторая за эта же время-30 дверей.За сколько рабочих дней обе бригады ,работая вместе,установят двери в доме,в котором 220 квартир?

Answer 1

1) 25+30=55 дверей в день две бригады
2) 220:55=4 дня
ответ за 4 дня две бригады установят все двери

Answer 2

Problem Analysis

We have two teams, the first team installs 25 doors per day, and the second team installs 30 doors per day. We need to determine how many working days it will take for both teams to install doors in a building with 220 apartments.

Solution

To find the number of working days required for both teams to install doors in the building, we can calculate the total number of doors installed per day by both teams and then divide the total number of doors by the daily installation rate.

Let's calculate the total number of doors installed per day by both teams: - The first team installs 25 doors per day. - The second team installs 30 doors per day.

Therefore, the total number of doors installed per day by both teams is 25 + 30 = 55 doors.

Now, let's calculate the number of working days required to install doors in the building: - The building has 220 apartments. - Since both teams install 55 doors per day, the number of working days required is 220 / 55 = 4 days.

Therefore, both teams, working together, will install the doors in the building in 4 days.

Answer

Both teams, working together, will install the doors in the building with 220 apartments in 4 days.