Предмет: Математика, автор: Аноним

Одна бригада строит баню за 15 дней, а другая - за 10 дней. За сколько дней можно закончить постройку бани, если нанять сразу две бригады? ​

Ответы

Автор ответа: fanta2310
0

Ответ:

Пошаговое объяснение:

1) 1 : 15 = 1/15 производительность первой бригады

2) 1 : 10 = 1/10 производительность второй бригады

3) 1/15 + 1/10 = 2/30 + 3/30 = 5/30 = 1/6 общая производительность

4) 1 : 1/ 6 = 6 дней за столько построят , работая вместе

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