Question

Срочно,помогите! 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. Помогите пожалуйста!

Answer 1

X ч - общ. время
28x - 1 -я бригада сделала костюмов за  x часов
21x - 2 -я бригада сделала костюмов за  x часов
28x +21x = 441
49x = 441
x =9ч

Answer 2

Calculating the Time Taken to Sew Costumes

To calculate the time taken by the two brigades to sew the costumes, we can use the following approach:

1. Calculate the combined output of both brigades per hour. 2. Divide the total number of costumes by the combined output to find the total hours taken.

Let's proceed with the calculations:

Step 1: Calculate the Combined Output per Hour The first brigade makes 28 costumes per hour, and the second brigade makes 21 costumes per hour. Therefore, the combined output per hour is 28 + 21 = 49 costumes per hour.

Step 2: Calculate the Total Hours Taken To find the total hours taken, we divide the total number of costumes (441) by the combined output per hour (49): Total hours = 441 / 49 = 9 hours.

So, the two brigades took 9 hours to sew the 441 costumes.

[[SOURCE #1]]