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My favorite musical style is k-pop. This music makes me cheerful, but sometimes even sad.

My favorite band is BTS. I think she's fantastic. This is a popular Korean band. BTS is a very successful and popular band. Their concerts are always attended by many people, and there is practically no free space in concert halls. Her songs are energetic and full of meaning.

I have never been to a concert of this band, because she never came to my city. But I really want to see her. And I hope that soon I will go to a concert of BTS, the best band in the world!

Пошаговое объяснение:

Обозначим красные воздушные шары - "К", зелёные - "З", синие - "С".

Пусть в коробке лежит х "К". ⇒ "З"=х/8 , а "С"≥1.

x+\frac{x}{8}+C=19.\ \ \ \ \ \ \ \ (1)x+

8

x

+C=19. (1)

Количество воздушных шаров - целое число. ⇒

\frac{x}{8}

8

x

- должно быть целым числом. Исходя из условия задачи х может равняться 8 и 16.

Подставляем х=8 в уравнение (1).

\begin{gathered}8+\frac{8}{8}+C=19\\8+1+C= 19\\9+C=19\\C=10.\end{gathered}

8+

8

8

+C=19

8+1+C=19

9+C=19

C=10.

Но по условию задачи "К">"C"≥1 ⇒ х≠8.

Подставляем х=16 в уравнение (1).

\begin{gathered}16+\frac{16}{8} +C=19\\16+2+C=19\\18+C=19\\C=1.\end{gathered}

16+

8

16

+C=19

16+2+C=19

18+C=19

C=1.

По условию задачи "К">"C"≥1 ⇒ x=16