Question: Kat gets a 95% on her first math test and an 80% on her second math test. If she wants an average grade of at least 90% in her math class, what does she need to get on her third final math test?
Answer: Step-by-step reasoning process: Let x = the percent needed on her third math test. (95 + 80 + x) / 3 = 90. (95 + 80 + x) = 270. x = 270 - 95 - 80. x = 95.
So the answer is 95.

Question: Carol has $60 and saves $9 per week. Mike has $90 and saves $3 per week. How many weeks before Carol and Mike both have the same amount of money?
Answer: Step-by-step reasoning process: Let x = the number of weeks. 60 + 9x = 90 + 3x to set them equal. 9x = 30 + 3x. 6x = 30. x = 5. In 5 weeks they will have equal money.
So the answer is 5.

Question: At the Taylor family reunion, there were 45 kids and 123 adults. When they sat down to eat, there were 14 tables. How many people sat at each table?
Answer: Step-by-step reasoning process: There were 45 kids + 123 adults = 168 people at the reunion. All the people sat at 14 tables, so 168 people / 14 tables = 12 people per table.
So the answer is 12.

Question: If I give my brother 2 marbles I will have double his number of marbles, but my friend will have triple the number I do. The total number of marbles we have together is 63. How many marbles do I have?
Answer:
Step-by-step reasoning process: Let X be the number of marbles I have. If I give my brother 2 marbles, I'll have X - 2 marbles left. And my brother will have (X - 2) / 2 marbles. And my friend will have (X - 2) * 3 left. So the total number of marbles is X - 2 + (X - 2) / 2 + (X - 2) * 3 = 63. (X - 2) * 9 / 2 = 63. X - 2 = 14. X = 16 marbles.
So the answer is 16.