Write an email to a pen friend about you school and classroom (90words) follow the plan.
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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

A: What were you doing when the robbery took place?

B: I was standing in the queue.

A: What happened next?

B: Two men were pushing their way to the front. One of them was holding a gun.

A: Then what the men were doing?

B: They ordered the cashier to give them the money.

A: How did police find out about the robbery?

B: Well, the cashier set off the alarm while the robbers were putting the money in a bag.

A: And what happened when the police arrived?

B: The man with the gun dropped it, but it wasn't a real gun after all; it was a plastic one.

Объяснение: