Question

Две бригады сшили 441 детский костюм работая вместе Первая бригада изготовила 28 костюмов часа 2 21 костюм час Сколько часов бригады сшили костюмы

Answer 1

1) 28 + 21 = 49 костюмов всего
2) 441 : 49 = 9 часов работали

Answer 2

Calculation of Hours Worked by the Two Brigades

To calculate the number of hours worked by the two brigades to sew 441 children's costumes, we need to determine the number of costumes each brigade can sew per hour.

According to the information provided, the first brigade can sew 28 costumes in 2 hours, which means they can sew 14 costumes per hour (28 costumes / 2 hours = 14 costumes per hour).

The second brigade can sew 21 costumes in 1 hour, which means they can sew 21 costumes per hour (21 costumes / 1 hour = 21 costumes per hour).

To find the total number of hours worked by the two brigades, we divide the total number of costumes (441) by the combined rate of costumes sewn per hour by both brigades.

Let's calculate the total number of hours worked:

Total number of costumes: 441 costumes

Combined rate of costumes sewn per hour by both brigades: 14 costumes per hour (first brigade) + 21 costumes per hour (second brigade) = 35 costumes per hour

Total number of hours worked: 441 costumes / 35 costumes per hour = 12.6 hours

Therefore, the two brigades worked a total of approximately 12.6 hours to sew 441 children's costumes.

Please note that the calculation assumes a constant rate of sewing throughout the entire duration of work by the two brigades.