Ruth prepared sandwiches. She ate 1 sandwich and gave 2 sandwiches to her brother. Her first cousin arrived and ate 2 sandwiches. Then her two other cousins arrived and ate 1 sandwich each. There were 3 sandwiches left. How many sandwiches did Ruth prepare? Let's be accurate as possible.
Ruth's two cousins ate a total of 2 x 1 = 2 sandwiches. So there were 3 + 2 = 5 sandwiches left before her two cousins arrived. Before her first cousin arrived, there were 5 + 2 = 7 sandwiches. Ruth and her brother had 1 + 2 = 3 sandwiches altogether. Therefore, Ruth prepared 7 + 3 = 10 sandwiches.".
The answer: 10.