Question

Две бригады сшили 441 детский костюм,работая вместе.Первая бригада изготавливала 28 костюмов в час,а вторая-21 костюм в час.Сколько часов бригады шили костюмы?

Answer 1

28+21=49 час
441/49=9 часов бригады шили костюмы

Answer 2

28+21=49
441/49=9 часов

Answer 3

Calculation of Hours Worked by the Brigades

To determine the number of hours the brigades worked to sew 441 children's costumes, we need to calculate the time taken by each brigade separately and then add them together.

Let's start with the first brigade, which can sew 28 costumes per hour. To find the number of hours it took for the first brigade to sew 441 costumes, we divide the total number of costumes by the number of costumes sewn per hour:

Number of hours taken by the first brigade = Total number of costumes / Number of costumes sewn per hour by the first brigade

Number of costumes sewn per hour by the first brigade = 28 costumes/hour

Total number of costumes = 441 costumes

Using the above formula, we can calculate the number of hours taken by the first brigade:

Number of hours taken by the first brigade = 441 costumes / 28 costumes/hour

Now, let's move on to the second brigade, which can sew 21 costumes per hour. Using the same formula as above, we can calculate the number of hours taken by the second brigade:

Number of hours taken by the second brigade = 441 costumes / 21 costumes/hour

Finally, to find the total number of hours worked by both brigades, we add the number of hours taken by each brigade:

Total number of hours worked by both brigades = Number of hours taken by the first brigade + Number of hours taken by the second brigade

Let's calculate the values:

Number of hours taken by the first brigade = 441 costumes / 28 costumes/hour = 15.75 hours

Number of hours taken by the second brigade = 441 costumes / 21 costumes/hour = 21 hours

Total number of hours worked by both brigades = 15.75 hours + 21 hours = 36.75 hours

Therefore, the two brigades worked for approximately 36.75 hours to sew 441 children's costumes.