Question

Купили 16 тетрадей по 22 копейки и по 45 копеек,заплатив за всю покупку 4р 67к.сколько купили тетрадей каждого вида

Answer 1

x+y=16
22x+45y=467

x=16-y
22(16-y)+45y=467
352-22y+45y=467
23=115:23
y=5 по 45 копеек
x=16-5
x=11 по 22 копейки

Answer 2

Calculating the Number of Notebooks Bought

To solve this problem, we can use a system of equations. Let's denote the number of notebooks bought at 22 kopecks as x and the number of notebooks bought at 45 kopecks as y. We are given the following information: 1. The total cost of the notebooks is 4 rubles 67 kopecks. 2. The cost of each type of notebook.

We can set up the following equations based on the given information: 1. 22x + 45y = 467 (in kopecks, as 1 ruble = 100 kopecks) 2. x + y = 16 (the total number of notebooks bought)

We can solve this system of equations to find the values of x and y.

Solving the System of Equations

Let's solve the system of equations using the substitution method.

First, we can express x in terms of y from the second equation: x = 16 - y

Substitute this expression for x into the first equation: 22(16 - y) + 45y = 467

Simplify and solve for y: 352 - 22y + 45y = 467 23y = 115 y = 5

Now that we have found the value of y, we can substitute it back into the equation x = 16 - y to find x: x = 16 - 5 x = 11

Answer

So, the number of notebooks bought at 22 kopecks is 11, and the number of notebooks bought at 45 kopecks is 5.