Question

Али купил 5 авторучек, 4 тетрадей и две резинки за 41 рублей. Алия купила 7 авторучки, 3 тетради и резинку за 42 рубля. Сколько заплатил Санжар за авторучку , 6 тетрадей и 4 резинки? Помогите пожалуйста. Дам 30 баллов

Answer 1

Ответ:

5x+4y+2z=41                 Авторучки - х       Тетради - y     Резинка - z

7x+3y+z=42    

15x+12y+6z=123  

14x+6y+2z=84  

(15x+12y+6z) - (14x+6y+2z) = 123 - 84

X+6Y+4Z=39         ответ 39 руб!!!!

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Answer 2

To find out how much Sanzhar paid for 6 notebooks, 4 erasers, and 4 pens, we can calculate the total cost for each item and then add them together.

According to the information given, Ali bought 5 pens, 4 notebooks, and 2 erasers for 41 rubles, while Aliya bought 7 pens, 3 notebooks, and 1 eraser for 42 rubles.

Let's calculate the cost of each item:

- Cost of 1 pen for Ali: 41 rubles / 5 pens = 8.2 rubles per pen. - Cost of 1 notebook for Ali: 41 rubles / 4 notebooks = 10.25 rubles per notebook. - Cost of 1 eraser for Ali: 41 rubles / 2 erasers = 20.5 rubles per eraser.

- Cost of 1 pen for Aliya: 42 rubles / 7 pens = 6 rubles per pen. - Cost of 1 notebook for Aliya: 42 rubles / 3 notebooks = 14 rubles per notebook. - Cost of 1 eraser for Aliya: 42 rubles / 1 eraser = 42 rubles per eraser.

Now, let's calculate the total cost for Sanzhar's items:

- Cost of 6 notebooks for Sanzhar: 6 notebooks * 10.25 rubles per notebook = 61.5 rubles. - Cost of 4 erasers for Sanzhar: 4 erasers * 20.5 rubles per eraser = 82 rubles. - Cost of 4 pens for Sanzhar: 4 pens * 8.2 rubles per pen = 32.8 rubles.

Adding up these costs, we get:

61.5 rubles + 82 rubles + 32.8 rubles = 176.3 rubles.

Therefore, Sanzhar paid 176.3 rubles for 6 notebooks, 4 erasers, and 4 pens.