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aleshkaaaa1
aleshkaaaa1
31.01.2022 07:23 •  Математика

Мама покупала конфеты для новогодних подарков. На покупку шоколадных конфет она израсходовала 2/5 всех денег. Затем она купила 2 кг карамели по 120 рублей за килограмм. Сколько у неё осталось денег? Хватит ли оставшихся денег на покупку 2 шоколадок по 45 р. за штуку, если у мамы было 700 р.?

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Ответ:

У мамы было 700 рублей. На покупку шоколадных конфет она потратила 5/12 этой суммы, значит, у нее осталось 1 - 5/12 = 7/12 изначальной суммы. Вычислим, сколько осталось денег

700 * 7/12 = 408 1/3.

Найдем, сколько она потратила денег на 2 кг карамели по 120 рублей за кг.

2 * 120 = 240 рублей.

Вычислим, сколько у нее осталось денег после этой покупки.

408 1/3 - 240 = 168 1/3.

Сколько стоят 2 шоколадки по 45 рублей?

2 * 45 = 90 рублей.

168 1/3 > 90.

Оставшихся 168 1/3 рублей хватит на шоколадки.

4,4(22 оценок)
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Ответ:
tseng7788
tseng7788
31.01.2022

Пошаговое объяснение:

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4,6(44 оценок)
Ответ:
domna0404
domna0404
31.01.2022

В решении.

Пошаговое объяснение:

Расстояние по трассе между двумя посёлками 1540 м. Из этих посёлков одновременно навстречу друг другу выехали два велосипедиста. Скорость первого равна 3 м/с, скорость второго 4 м/с. Какое расстояние будет между велосипедистами через 3 мин после начала движения? Через какое время после начала движения велосипедисты встретятся?

Формула движения: S=v*t

S - расстояние            v - скорость             t – время

3 минуты=60*3=180 секунд.

1)Найти расстояние 1 велосипедиста:

3*180=540 (м).

2)Найти расстояние 2 велосипедиста:

4*180=720 (м).

3)Какое расстояние будет между велосипедистами через 3 мин после начала движения?

1540 - (540+720)= 280 (м).

4)Через какое время после начала движения велосипедисты встретятся?

Общее расстояние 1540 м.

Общая скорость 3+4=7 (м/сек).

Общее время: 1540 : 7 = 220 (сек.)

4,5(21 оценок)
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