Question

4 набора линеек и 2 ластика стоят 132 рубля, а 4 набора линеек и 5 ластиков стоят 150 рублей.Сколько рублей стоит один ластик?

Answer 1

132-150= 18(3 ластика)
18:3=6 стоит один ластик

Answer 2

Calculation of the Cost of One Eraser

To find the cost of one eraser, we can set up a system of equations based on the given information.

Let's assume that the cost of one set of rulers is x rubles, and the cost of one eraser is y rubles.

According to the given information, 4 sets of rulers and 2 erasers cost 132 rubles, and 4 sets of rulers and 5 erasers cost 150 rubles.

We can write the following equations:

Equation 1: 4x + 2y = 132 Equation 2: 4x + 5y = 150

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

Let's use the method of elimination to solve the system:

Multiplying Equation 1 by 5 and Equation 2 by 2, we get:

Equation 3: 20x + 10y = 660 Equation 4: 8x + 10y = 300

Subtracting Equation 4 from Equation 3, we eliminate the variable y:

(20x + 10y) - (8x + 10y) = 660 - 300 12x = 360 x = 30

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

4(30) + 2y = 132 120 + 2y = 132 2y = 12 y = 6

Therefore, one eraser costs 6 rubles.

Please note that the above calculations are based on the given information and the assumption that the cost of one set of rulers is x rubles and the cost of one eraser is y rubles.