Question: Emma is 7 years old. If her sister is 9 years older than her, how old will Emma be when her sister is 56?
Answer with step-by-step thinking: Emma's sister is 7 + 9 = 16 years old. In this many years, Emma's sister will be 56 years old: 56 - 16 = 40 years. When her sister is 56 years old, Emma will be 7 + 40 = 47 years.
So the answer is 47.

Question: Angie bought 3 lbs. of coffee at the store today. Each lb. of coffee will brew about 40 cups of coffee. Angie drinks 3 cups of coffee every day. How many days will this coffee last her?
Answer with step-by-step thinking: A pound of coffee makes 40 cups of coffee, so 3 lbs. coffee * 40 cups of coffee per lb. = 120 cups of coffee. Angie drinks 3 cups of coffee a day, so she has enough coffee to last her 120 cups of coffee / 3 cups of coffee per day = 40 days.
So the answer is 40.

Question: 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?
Answer with step-by-step thinking:
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.".
So the answer is 10.