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berdyugin
berdyugin
17.06.2022 07:04 •  Математика

Першого дня у магазині купили 4 упаковки зошитів, а другого 7 таких самих упаковок. причому першого дня купили на 36 зошитів менше, ніж другого. скільки зошитів купили першого дня, а скільки другого​

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Ответ:
kristinasav051
kristinasav051
17.06.2022

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.

4,8(75 оценок)
Ответ:
khadija2004
khadija2004
17.06.2022

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

4,6(97 оценок)
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Ответ:
astasevbogdanp08dn2
astasevbogdanp08dn2
17.06.2022

Пошаговое объяснение:

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4,7(20 оценок)
Ответ:
hadaevbogdan
hadaevbogdan
17.06.2022

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.

4,4(36 оценок)
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