Question

Между взрывом паровой машины и завершением работы над инкубатором прошло 91 час. Пятьдесят шесть часов из этого времени было потрачено на ночной сон, в четыре раза меньше времени дети читали книги о животноводстве, а остальных время было использовано для сооружение инкубатора. Сколько часов Коля с Мишкой сооружали инкубатор?

Answer 1

91-56=35(ч)книги и инкуб 
56:4=14(ч)книги 
35-14=21(ч)инкуб 
ответ:21 час

Answer 2

Calculation of Time Spent on Building the Incubator

To calculate the number of hours spent by Kolya and Mishka on building the incubator, we need to subtract the time spent on other activities from the total time elapsed.

Given information: - Total time elapsed: 91 hours - Time spent on sleep: 56 hours - Time spent on reading books about animal husbandry: 4 times less than the time spent on sleep - Remaining time used for building the incubator

Let's calculate the time spent on reading books about animal husbandry: - Time spent on reading books = Time spent on sleep / 4 = 56 hours / 4 = 14 hours

Now, let's calculate the time spent on building the incubator: - Remaining time = Total time elapsed - Time spent on sleep - Time spent on reading books - Remaining time = 91 hours - 56 hours - 14 hours = 21 hours

Therefore, Kolya and Mishka spent 21 hours building the incubator.