Question

За 3 дня плотник изготовил 300 оконных рам, причем за первый день он изготовил 5/12 всех рам, а за второй день 7/15 всех рам. Сколько он изготовил за 3-ий день?

Answer 1

Вычисляем постепенно
Сложим работу за два дня 
5/12 + 7/15 = 53/60 от всей работы.
Осталось
1 - 53/60 = 7/60 
300 * 7/60 = 35 шт - ОТВЕТ
ИЛИ
300 * 5/12 = 125 - первый день
300 * 7/15 = 140 - во второй день
300 - 125 - 140 = 35 шт - в третий день - ОТВЕТ 

Answer 2

Task: Calculate the number of window frames produced on the third day.

To calculate the number of window frames produced on the third day, we need to determine the fraction of frames produced on the first and second days and then calculate the remaining fraction for the third day.

Let's start by calculating the fraction of frames produced on the first day. According to the information given, the carpenter produced 5/12 of all the frames on the first day.

Next, let's calculate the fraction of frames produced on the second day. The carpenter produced 7/15 of all the frames on the second day.

To find the fraction of frames produced on the third day, we need to subtract the fractions produced on the first and second days from 1 (since the sum of all three fractions should be equal to 1).

Let's calculate the fraction of frames produced on the third day:

1 - (5/12 + 7/15) = 1 - (25/60 + 28/60) = 1 - 53/60 = 7/60

Therefore, the carpenter produced 7/60 of all the frames on the third day.

Now, to find the number of frames produced on the third day, we need to multiply the fraction of frames produced on the third day by the total number of frames:

(7/60) * 300 = 35

Therefore, the carpenter produced 35 window frames on the third day.

Please note that the above calculations are based on the given information and assumptions made.