2) Составь и реши две задачи, обратные данной.

1. Task 1: If 27 rubles were earned from selling notebooks at 3 rubles each, how many notebooks were sold? Answer: 27 / 3 = 9 notebooks.
2. Task 2: If 9 notebooks were sold for a total of 27 rubles, what was the price per notebook? Answer: 27 / 9 = 3 rubles.