Пошаговое объяснение:
В упаковці - х зошитів, тоді
першого дня купили 4*х, а другого дня 7*х.
7*х-4*х=36 ( різниця в кількості зошитів між першим та другим днем)
3х=36
х=12
Отже в одній упаковці - 12 зошитів, тоді
першого дня купили 4*12=48 зошитів, а другого дня - 7*12=84 зошити
Пошаговое объяснение:
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44 километра
Пошаговое объяснение:
Так как собственная скорость лодки - 6 км/ч, а реки - 2 км/ч, то при движении по течению эти две скорости суммируются. 6+2 = 8 км/ч.
Так как лодка двигалась по течению 3 часа, то умножаем её скорость на время, чтобы узнать расстояние. 8*3 = 24 км - расстояние, пройденное лодкой по течению.
Теперь узнаем скорость лодки против течения реки. Для этого нужно из собственной скорости лодки вычесть скорость течения, потому что течение мешает лодке двигаться. 6 - 2 = 4 км/ч.
Так как лодка двигалась против течения 5 часов, то умножаем её скорость на время, чтобы узнать расстояние. 4*5 = 20 км - расстояние, пройденное лодкой против течения.
Складываем эти результаты - 24+20 = 44 километра всего лодка.
ОТВЕТ: 44 км.
1) 7 – 4 = 3 (уп.) — на стільки більше упаковок купили другого дня, ніж першого.
2) 36 : 3 = 12 (з.) — зошитів у одній упаковці.
3) 12 • 4 = 48 (з.) — зошитів купили першого дня.
4) 12 • 7 = 84 (з.) — зошитів купили другого дня.
Відповідь: 48 зошитів купили першого дня, а 84 зошити – другого дня.