Question

СРОЧНО ДАЮ 80 БАЛЛОВ. За два зошити заплатили 21 грн 50 коп. Скільки коштує кожен із зошитів.якщо один з них на 15% дешевший за другий. Тільки рівнянням розв*язок

Answer 1

Ответ:

11 23/37 грн,   10 41/74 грн.

Пошаговое объяснение:

Нехай один зошит коштує х грн, тоді другий 0,85х грн.

х+0,85х=21,5

1,85х=21,5

х=11 23/37

Один зошит коштує 11 23/37 грн, другий 21 1/2 - 11 23/37 =10 41/74 грн.

Answer 2

To solve this problem, let's assign variables to the prices of the two notebooks. Let's say the price of the more expensive notebook is x (in hryvnias) and the price of the cheaper notebook is 0.85x (since it is 15% cheaper).

According to the information given, the total cost of the two notebooks is 21.50 hryvnias. We can set up the following equation to represent this:

x + 0.85x = 21.50

To solve for x, we can combine like terms:

1.85x = 21.50

Now, we can isolate x by dividing both sides of the equation by 1.85:

x = 21.50 / 1.85

Evaluating this expression, we find that x is approximately 11.62 hryvnias.

Therefore, the more expensive notebook costs approximately 11.62 hryvnias, and the cheaper notebook costs approximately 0.85 times that amount, which is approximately 9.88 hryvnias.

So, each notebook costs approximately 11.62 hryvnias and 9.88 hryvnias, respectively.

I hope this helps! Let me know if you have any further questions.