Question

За дача 2. На двух полках стоит 120 книг — на первой полке в 3 раза больше, чем на второй. Сколько книг стоит на каждой полке?

Answer 1

Ответ:

Пошаговое объяснение:

х- книг на второй полке

3х- на первой

3х+х=120

4х=120

х=30 книг на второй полке

3*30=90 книг на первой полке

Answer 2

Ответ:

Пусть на второй полке будет х книг, тогда на первой полке будет 3х. Всего книг 120. Составим уравнение:

х+3х=120;

4х=120;

х=30 - количество книг на второй полке;

3*30=90. - количество книг на первой полке

Пошаговое объяснение:

Answer 3

Solution:

Let's denote the number of books on the first shelf as X and the number of books on the second shelf as Y.

Given that the total number of books on both shelves is 120, we can express this as an equation: X + Y = 120.

We also know that the number of books on the first shelf is 3 times the number of books on the second shelf: X = 3Y.

To solve for the values of X and Y, we can use the substitution method.

Substitute the value of X from the second equation into the first equation: 3Y + Y = 120.

Combine like terms: 4Y = 120.

Solve for Y: Y = 120 / 4 = 30.

Now that we have the value of Y, we can find the value of X using the second equation: X = 3 * 30 = 90.

So, there are 90 books on the first shelf and 30 books on the second shelf.

Answer:

Therefore, there are 90 books on the first shelf and 30 books on the second shelf.