Question

Две бригады вместе выполнили работу за 5 дней. За сколько дней выполнила бы эту работу бригада, если первая выполняет её за 15 дней?

Answer 1

Либо вопрос с подвохом либо 15 - 5 = 10 ( д.) вторая бригада бы делала всю работу одна

Answer 2

Calculation of Work Completion Time

To determine how long it would take the second brigade to complete the work if the first brigade completes it in 15 days, we can use the concept of work rates.

Let's assume that the work to be completed is represented by the variable W. The first brigade completes the work in 15 days, so their work rate can be calculated as 1/15 of the work per day.

Since the two brigades together completed the work in 5 days, we can calculate their combined work rate as 1/5 of the work per day.

To find the work rate of the second brigade, we subtract the work rate of the first brigade from the combined work rate:

Combined work rate - Work rate of the first brigade = Work rate of the second brigade

Let's calculate the work rate of the second brigade:

1/5 - 1/15 = 3/15 - 1/15 = 2/15 of the work per day

Now, to find the number of days it would take the second brigade to complete the work, we can use the formula:

Number of days = Total work / Work rate

Since the total work is represented by W, we can calculate the number of days as:

Number of days = W / (2/15) = (15W) / 2

Therefore, if the first brigade completes the work in 15 days, the second brigade would complete the same work in (15W) / 2 days.

Please note that the specific value of W is not provided in the question, so we cannot determine the exact number of days without that information.