Q: Sarah decided to pull weeds from her garden. On Tuesday she pulled 25 weeds. The next day she pulled three times the number of weeds she did the day before. On Thursday her allergies bothered her and she could only pull up one-fifth of the weeds she pulled on the day before. Finally, on Friday it rained for half the day and she managed to pull up 10 fewer weeds than she did on Thursday. In total, how many weeds did she pull up?
A: On Wednesday she pulled 25 * 3 = 75 weeds. On Thursday she pulled 75 / 5 = 15 weeds. On Friday she pulled 15 - 10 = 5 weeds. In total she pulled 25 + 75 + 15 + 5 = 120 weeds. The answer is 120.

Q: In two years, Ophelia will be four times as old as Lennon. If Lennon is currently eight years old, how old is Ophelia?
A: In two years, Lennon will be 2 + 8 = 10 years old. Ophelia will be 4 * 10 = 40 years old in two years. Currently, Ophelia is 40 - 2 = 38 years old. The answer is 38.

Q: There are 24 students in the class. One-third had their school portraits taken before lunch. After lunch, but before gym class, 10 additional students had their portraits taken. After gym class, how many students have not yet had their picture taken?
A:
Before lunch, 24 / 3 = 8 students were photographed. Then 8 + 10 = 18 have been photographed by gym class. So 24 - 18 = 6 remain. The answer is 6.