Question: Sally is selling boxes of crackers for her scout troop's fund-raiser. If she sells 50% more on Sunday than she sold on Saturday, then she'll have sold a total of 150 boxes on the two days. How many boxes did she sell on Saturday?
Answer with step-by-step thinking: Let S be the number of boxes sold on Saturday. S + 1.5S = 150. 2.5S = 150. S = 60. Sally sold 60 boxes on Saturday.
So the answer is 60.

Question: In preparation for the upcoming Olympics, Rita's swimming coach requires her to swim a total of 1,500 hours. Rita has already completed 50 hours of backstroke, 9 hours of breaststroke, and 121 hours of butterfly, but she is unhappy with her inconsistency. She has therefore decided to dedicate 220 hours every month practicing freestyle and sidestroke. How many months does Rita have to fulfill her coach's requirements?
Answer with step-by-step thinking: So far, time spent practicing backstroke, breaststroke, and butterfly is 50 + 9 + 121 = 180 hours. Since Rita's must swim 1500 hours, the freestyle and sidestroke practice sessions will take 1500 - 180 = 1320 hours. Rita will practice for 220 hours / month, meaning she will meet her coach's target in 1320 / 220 = 6 months.
So the answer is 6.

Question: Djibo is 17 years old. Five years ago Djibo added his age with his sister's age and the sum was 35. How many years old is Djibo's sister today?
Answer with step-by-step thinking:
Age 5 years ago: 17 - 5 = 12. Sister's age 5 years ago: 35 - 12 = 23. Sister's age today: 23 + 5 = 28 years. Djibo's sister is 28 years old today.
So the answer is 28.