Предмет: Математика, автор: darina8983

до 20 кг суміші піску та цементу що містить %30 цементу , додали ще 3 кг цементу .
Скільки відцотків цементу становить в одержаній сумиші .
Пж помогите срочно у мегя кр надо здать ​

Ответы

Автор ответа: Nez0k
0

Ответ:

39.1%

Пошаговое объяснение:

1) 20 кг * 0.30 = 6 кг цементу - на початку

2) 6 кг + 3 кг = 9 кг цементу - сума

3) 20 кг + 3 кг = 23 кг - загальна маса одержаної суміші

4) (9 кг / 23 кг) * 100% = 39.1%


darina8983: сорри я забила написати можна с усним описом
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