Question

Оля, Марина, Вера и Рая к купили открытки. Оля купила немецкую, французскую и английскую открытки, Марина - русскую, французскую и английскую, Вера - русскую, немецкую и английскую открытки, Рая - русскую, французскую и немецкую открытки. Узнайте, сколько стоит русская открытка, если Оля заплатила 40 руб., Марина - 45 руб.,Вера - 44 руб., Рая - 27 руб.

Answer 1

В математике я не очень то разбираюсь,но попробовала решить и вот,что вышло:
1)40+45+44+27=156
2)156:4=39
Ответ:русская открытка стоит 39 рублей.
Я не уверена в ответе поэтому лучше,подожди других решений

Answer 2

Solution:

To find the cost of a Russian postcard, we can use the given information about the prices paid by each person for the postcards they bought.

- Olga paid 40 rubles for a German, French, and English postcard. - Marina paid 45 rubles for a Russian, French, and English postcard. - Vera paid 44 rubles for a Russian, German, and English postcard. - Raya paid 27 rubles for a Russian, French, and German postcard.

We need to find the cost of the Russian postcard.

Let's solve for the cost of the Russian postcard.

First, we'll assign variables to the costs of the postcards: - Let's say the cost of the Russian postcard is R rubles. - The cost of the French postcard is F rubles. - The cost of the English postcard is E rubles. - The cost of the German postcard is G rubles.

We can then set up a system of equations based on the given information: 1. Olga: - 40 = G + F + E 2. Marina: - 45 = R + F + E 3. Vera: - 44 = R + G + E 4. Raya: - 27 = R + F + G

We can solve this system of equations to find the cost of the Russian postcard.

Let's solve for R.