Предмет: Математика, автор: uylia1212

Имеются бронзовые, серебряные и золотые монеты. Известно, что 40 бронзовых и 8 серебряных монеты можно обменять на 6 золотых. За 4 серебряных можно получить 2 золотые и 8 бронзовых. Во сколько раз золотая монета дороже бронзовой?

срочно ооочень.

Ответы

Автор ответа: torbaratibor

Ответ:

в 12 раз

Пошаговое объяснение:

обозначим бронзовую монету как x,

серебряную - как y,

а золотую как z

тогда:

40x + 8y=6z

4y=2z+8x

переносим 8y в другую часть и получаем

40x=6z-8y,

заметим что 8y это удвоенное 4у или же удвоенное 2z+8x=>

40x=6z-4z-16x

40x=2z-16x

2z =40x-16x=24x

z=24x:2

z=12x

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: katykalagina

I. a) Put in the sentences the suitable words. Each word or word combination is only used once.
foreign; is spread; is washed by; capital; island; is situated; powerful; languages; cities; occupies; population; area; country:

1. India … in Asia.
2. There are 15 official … in India and thousands of different dialects.
3. Great Britain is an … where England, Scotland, and Wales are located.
4. What city is the … of Japan? – Tokyo is.
5. The UK … the Atlantic Ocean in the north.
6. Success in … language learning is not connected with a person's natural talent.
7. The … of the Russian Federation is about 112 thousand of people.
8. Australia … a whole continent.
9. The USA are considered to be one of the most … countries in the world.
10. English language … all over the world.
b)
The United States of America 1)… in the central part of North America. Its western coast 2)… by the Pacific Ocean and its eastern coast – by the Atlantic Ocean. The total 3) … of the USA is over nine million square kilometers. The 4)… of the USA is about 250 million people; most of them live in towns and cities. The USA is a very large 5)… . The 6)… of the USA is Washington. The largest 7)… of this country are: New York, Los Angeles, Chicago, Detroit and others.
II. Put in: who or which.
1. She returned me the book … I gave her yesterday.
2. Do you know the student … has won the first prize in the competition?
3. The mother tongue is a language … a child learns naturally, in his/ her family.
4. I knew a lady … played tennis every day.
5. Kate found a bag … she liked.
III. a) Use each verb in Present Simple Passive, Past Simple Passive or Future Simple Passive.
1. Bread (eat) every day.
2. The letters (receive) yesterday.
3. Nick (send) to Moscow next week.
4. I (give) a very interesting book at the library last Friday.
5. Many houses (build) in our town every year.
6. This work (do) tomorrow.
b) Read a sentence and write another sentence with the same meaning. Use the Passive Voice.
1. Leo Tolstoy wrote the novel "War and Peace" in the nineteenth century.
2. A lot of children visit the circus every year.
3. The builders will reconstruct this theatre soon.
4. Scientists will solve most mysteries in the future.
5. The explorers gave the newspaper reporters a long interview.

1 год назад

Предмет: Окружающий мир, автор: эльнара22

4)Какого размера листья растения? Подчеркини.Крупные,средние,мелкие.

1 год назад

Предмет: Русский язык, автор: elenka733

привлечь инженеров определить падеж существительного с объяснением

1 год назад

Предмет: Литература, автор: gumenyukdanil1

какие произведения пушкина связаны с лицейскими годовщинами разных лет

7 лет назад

Предмет: Алгебра, автор: Dovakhin7

ПОМОГИТЕ ОЧЕНЬ СРОЧНО!

7 лет назад