Предмет: Математика, автор: Аноним

Сплав весит 3 кг и состоит из железа и никеля, причем масса никеля составляет 20% от массы железа. Сколько кг железа в сплаве?

Ответы

Автор ответа: selmash21

3

3кг ---100%
? кг----20%
3×20÷100=0.6кг никеля
3-0.6=2.4кг железа в сплаве

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: Аноним

The staff and its duties
There are ten people on the staff. They can be divided into two groups. One group works in the dining room. They serve the customers. Another group works in the kitchen. They prepare meals for the customers. The head chef, Anna, comes to work at 10 o’clock in the morning. Anna made a new summer menu with many summer fruits and vegetables. She knows that people do not want heavy meals during hot weather. Anna works all day, often more than 8 hours a day. She plans the menu and manages the staff in the kitchen. She cooks meat dishes and sauces for the main course.
Today is Friday, a very busy day for the restaurant. Anna starts her work early at 8 o’clock because she must go to the market to buy fruit and vegetables for the weekend. This is not usually necessary, but the restaurant has recently changed suppliers. To day Anna must buy provisions herself until she finds new good suppliers. She will return to the restaurant at 10 o'clock and will start preparing the evening meal.
On Fridays, Mr. Black, the manager, prepares the accounts for the suppliers and organizes the work for the next week. Mr. Black’s first task in the morning is to check the telephone answering ma chine. He wants to know about the reservations for the next week.
He manages both the dining room staff and the kitchen staff. He also effectively manages the finances of the restaurant.
перевод пожалуйста правильный

1 год назад

Предмет: Окружающий мир, автор: кристина2057

2 задание и 3 задание

1 год назад

Предмет: Русский язык, автор: zzzzmi

от данных слов образуйте форму именительного падежа множественного числа:Доктор,тренер,инженер,профессор,трактор,директор

1 год назад

Предмет: Математика, автор: thisypizi

помогите пожалуйста решить задачу плиз

7 лет назад

Предмет: Химия, автор: sharafutdonov056

Допишите уравнение реакции в молекулярном и ионном виде:
1)NaOH+HCl=
2)KOH+SO2=
3)BaO+HCl=
4)K2S+Pb(NO3)2=
5)Zn+ CuCl2=

7 лет назад