Question

Петро працює у ресторані. Зараз у нього є З помиті тарілки і 12 непоми- тих. Для того, щоби помити одну тарілку, він витрачає 1 хв. Кожні 7 хв офіціант приносить ще 4 брудні тарілки. Скільки тарілок буде помито, коли Петро розпочне мити помаранчеву тарілку? А: 14 Б: 16 В: 18 Г: 20 Д: 22​

Answer 1

Відповідь: 22

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Покрокове пояснення:

1) 12-7=5(Т) не встигне помити

2)5+4=9(т) залишиться

3)9-7=2(т) залишилось

4)2+4=6(т)потрібно домити

5)5+9+2+6=22

Answer 2

To solve this problem, we need to determine how many dirty plates Petro will have to wash before he can start washing the orange plate. Petro starts with 12 dirty plates and receives 4 more dirty plates every 7 minutes.

Let's break down the problem step by step:

1. Petro starts with 12 dirty plates. 2. Every 7 minutes, he receives 4 more dirty plates. 3. Petro needs to wash 1 plate in 1 minute.

To find out how many dirty plates Petro will have to wash before he can start washing the orange plate, we can calculate the time it takes for Petro to receive the orange plate.

Since Petro receives 4 dirty plates every 7 minutes, we can divide the number of dirty plates by the rate at which he receives them to find out how many sets of 4 plates he will receive.

Let's calculate:

12 dirty plates + 4 dirty plates = 16 dirty plates (after 7 minutes) 16 dirty plates + 4 dirty plates = 20 dirty plates (after 14 minutes) 20 dirty plates + 4 dirty plates = 24 dirty plates (after 21 minutes) 24 dirty plates + 4 dirty plates = 28 dirty plates (after 28 minutes)

After 28 minutes, Petro will have received 28 dirty plates.

Now, let's calculate how many plates Petro can wash in 28 minutes. Since he can wash 1 plate in 1 minute, he can wash 28 plates in 28 minutes.

Therefore, Petro will have washed 28 plates before he can start washing the orange plate.

The correct answer is 28 plates (Г: 28).