Little Red Riding Hood carried a basket of eggs to sell in the city. She sold half and one of all the eggs for the first time, half and one of the remaining eggs for the second time, and half and one of the remaining eggs for the third time. At this time, there was still one egg left in the basket. How many eggs were there in the basket?

Little Red Riding Hood carried a basket of eggs to sell in the city. She sold half and one of all the eggs for the first time, half and one of the remaining eggs for the second time, and half and one of the remaining eggs for the third time. At this time, there was still one egg left in the basket. How many eggs were there in the basket?

There are: (1 + 1) × 2 = 4 eggs after the second sale; (4 + 1) × 2 = 10 eggs after the first sale; (10 + 1) × 2 = 22 eggs in the basket); a: there were 22 eggs in the basket