Question

Решить задачу полина сказала марине :"если бы у меня было на 3 тетради больше, чем сейчас то я бы имела тетрадей в 2 раза больше ,чем ты" Сколько тетрадей было у каждой девочки , если вместе у них 15 тетрадей

Answer 1

9 у Полины и 6 у Марины.

Answer 2

Solution:

Let's solve the problem step by step.

Let's assume that Polina has x notebooks and Marina has y notebooks.

According to the given information, Polina said, "if I had 3 more notebooks than I have now, I would have twice as many notebooks as you."

This can be represented as the equation: x + 3 = 2(y)

Also, it is given that together they have 15 notebooks: x + y = 15

We can solve these two equations to find the values of x and y.

Solving the Equations:

Using the second equation, we can express x in terms of y: x = 15 - y

Substitute the value of x in the first equation: (15 - y) + 3 = 2y

Solving for y: 15 - y + 3 = 2y 18 = 3y y = 6

Now, substitute the value of y back into the equation to find x: x = 15 - 6 x = 9

So, Polina has 9 notebooks and Marina has 6 notebooks.

Therefore, the solution is: Polina has 9 notebooks and Marina has 6 notebooks.