Question

Книжка и блокнот стоят 62 грн. Книжка и 3 блокнота стоят 90грн. Сколько стоит блокнот? Сколько стоит книжка?

Answer 1

1) 90 - 62 = 28 (грн) - коштують 2 блокноти.

2) 28 : 2 = 14 (грн) - коштує 1 блокнот.

3) 62 - 14 = 48 (грн)

Відповідь: книжка коштує 48 грн.

Answer 2

Calculation of Prices

To determine the cost of the notebook and the book, we can set up a system of equations based on the given information.

Let's assume the cost of the book is represented by x and the cost of the notebook is represented by y.

From the first statement, we know that the book and the notebook together cost 62 UAH, so we can write the equation:

x + y = 62 ---(Equation 1)

From the second statement, we know that the book and three notebooks together cost 90 UAH. We can write another equation based on this information:

x + 3y = 90 ---(Equation 2)

To solve this system of equations, we can use substitution or elimination method. Let's use the elimination method.

Solving the System of Equations

To eliminate the variable x, we can multiply Equation 1 by -1 and add it to Equation 2:

-x - y = -62
x + 3y = 90

Adding these two equations together, we get:

2y = 28

Dividing both sides of the equation by 2, we find:

y = 14

Now that we have the value of y, we can substitute it back into Equation 1 to find the value of x:

x + 14 = 62
x = 62 - 14
x = 48

Answer

Therefore, the cost of the notebook is 14 UAH and the cost of the book is 48 UAH.

Please note that these calculations are based on the given information and the assumption that the prices of the book and the notebook are represented by x and y respectively.