Answer this 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?
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.
The answer is 47.

Answer this question:James can buy a new computer for $600 and have it last 6 years, or buy 2 used computers for $200 each that each last 3 years. How much money will he save by picking the cheaper option?
First find the cost of the two used computers: $200 / computer * 2 computers = $400. Then subtract that cost from the cost of the new computer to find the savings: $600 - $400 = $200.
The answer is 200.

Answer this question:A psychiatrist has 4 patients that need 25 sessions in total. One of the patients needs 6 sessions. Another patient needs 5 more than that. How many sessions would the remaining patients need?
The second patient needs 6 + 5 = 11 sessions. The first two patients need 6 + 11 = 17 sessions total. 25 - 17 = 8 sessions.
The answer is 8.

Answer this question:In a classroom of 81 students, two-thirds are wearing striped shirts while the others are wearing checkered shirts. If there are 19 more students wearing shorts than checkered shirts, how many more students are wearing striped shirts than shorts?
81 / 3 = 27 students are wearing checkered shirts. 27 x 2 = 54 students are wearing striped shirts. 27 + 19 = 46 students are wearing shorts. 54 - 46 = 8 more students are wearing striped shirts than shorts.
The answer is 8.