Question

Один экскаватор за один день работы выкапывает 1/20 часть котлована а второй 1\25 какую часть котлована выкопают экскаваторы за 4 дня работая одновременнно

Answer 1

1/20+1/25=(25+20)/500=45/100=9/100 или 0,09 часть котлована 1 экс. и 2 экс.  вместе
9/100*4=9/25 или 0,36 часть котлована

Answer 2

Calculating the Excavators' Combined Work

To calculate the portion of the excavation completed by two excavators working simultaneously for 4 days, we can use the following approach:

1. Calculate the Daily Work of Each Excavator: - The first excavator completes 1/20 of the excavation in one day. - The second excavator completes 1/25 of the excavation in one day.

2. Calculate the Combined Daily Work: - To find the combined daily work, we add the daily work of both excavators: 1/20 + 1/25.

3. Calculate the Total Work in 4 Days: - Finally, we multiply the combined daily work by the number of days (4) to find the total portion of the excavation completed by both excavators.

Solution

1. Calculate the Daily Work of Each Excavator: - The first excavator completes 1/20 of the excavation in one day. - The second excavator completes 1/25 of the excavation in one day.

2. Calculate the Combined Daily Work: - The combined daily work of both excavators is: 1/20 + 1/25.

3. Calculate the Total Work in 4 Days: - The total portion of the excavation completed by both excavators working simultaneously for 4 days is: (1/20 + 1/25) * 4.

By following this approach, you can calculate the portion of the excavation completed by the two excavators working simultaneously for 4 days.