Question

На полке лежат тетради в клетку и в линейку ,причем тетрадей в клетку в 1,2 раза больше ,чем тетрадей в линейку .Найдите вероятность того,что взятая наугад тетрадь окажется тетрадью в линейку

Answer 1

А где общее количество тетрадей?

Answer 2

Problem Statement

На полке лежат тетради в клетку и в линейку, причем тетрадей в клетку в 1,2 раза больше, чем тетрадей в линейку. Найдите вероятность того, что взятая наугад тетрадь окажется тетрадью в линейку.

Solution

To find the probability of randomly selecting a notebook that is ruled, we need to determine the ratio of the number of ruled notebooks to the total number of notebooks.

Let's assume that the number of notebooks in grid format is represented by x, and the number of notebooks in ruled format is represented by y. According to the given information, we know that the number of notebooks in grid format is 1.2 times greater than the number of notebooks in ruled format.

Therefore, we can write the following equation:

x = 1.2y

To find the probability, we need to calculate the ratio of the number of ruled notebooks to the total number of notebooks:

P(ruled) = y / (x + y)

Substituting the value of x from the equation above, we get:

P(ruled) = y / (1.2y + y)

Simplifying the equation, we have:

P(ruled) = y / 2.2y

The y terms cancel out, and we are left with:

P(ruled) = 1 / 2.2

Therefore, the probability of randomly selecting a notebook that is ruled is 1 / 2.2.