Question

Було 9 паперових смужок. Деякі з них розрізали на 3 частини. Усіх разом стало 15. Скільки смужок розрізали?

Answer 1

1)(15-9):2=3полоски-разрезали.

Answer 2

Solution:

To solve this problem, we can set up an equation based on the given information. Let's denote the total number of uncut strips as x and the number of strips cut into 3 parts as y. We are given that there were 9 strips in total and that the sum of all the strips (both uncut and cut) is 15.

We can express this information in the following equation: x + y = 9 (total number of strips) x + 3y = 15 (total sum of all the strips)

Now, we can solve these equations to find the values of x and y.

Calculation:

Subtracting the first equation from the second equation: (x + 3y) - (x + y) = 15 - 9 2y = 6 y = 3

Now that we have found the value of y, we can substitute it back into the first equation to find the value of x: x + 3 = 9 x = 6

Answer:

So, the number of strips that were cut into 3 parts is 3.