Question

Для спортивной школы нужно сшить 240 спортивных костюмов. Одна бригада может выполнить эту работу за 20 дней, а другая- за 30 дней. Сколько дней понадобится бригадам, если они будут шить костюмы вместе?

Answer 1

1/20+1/30=(3+2)/60=5/60=1/12  1: 1/12=  12
жауабы:  12 дней

Answer 2

Calculation of the Time Required for the Brigades to Sew the Costumes Together

To calculate the time required for the brigades to sew the costumes together, we need to determine their combined efficiency.

Let's assume that Brigade A can sew 1 costume in 20 days, and Brigade B can sew 1 costume in 30 days.

To find their combined efficiency, we can calculate the reciprocal of the time taken by each brigade to sew one costume.

For Brigade A: 1 costume / 20 days = 1/20 costume per day.

For Brigade B: 1 costume / 30 days = 1/30 costume per day.

Now, we can add their efficiencies to find the combined efficiency:

1/20 costume per day + 1/30 costume per day = (3/60 + 2/60) costume per day = 5/60 costume per day.

Therefore, the combined efficiency of the brigades is 5/60 costume per day.

To determine the number of days required to sew 240 costumes, we can divide the total number of costumes by the combined efficiency:

240 costumes / (5/60 costume per day) = 240 * (60/5) days = 2880 days.

Therefore, it would take the brigades approximately 2880 days to sew the 240 costumes if they work together.

Please note that this calculation assumes that the efficiency of the brigades remains constant throughout the entire sewing process and does not take into account any potential variations or factors that may affect their productivity.