Answer the following question.
Jeremy buys 30 watermelons. He eats 3 watermelons per week. Each week he gives 2 to his dad. How many weeks will the watermelons last?
Step-by-step reasoning process: Jeremey goes through 3 + 2 = 5 watermelons per week. Therefore, the watermelons will last him to 30 / 5 = 6 weeks.
The answer is 6.

Answer the following question.
Christian is twice as old as Brian. In eight more years, Brian will be 40 years old. How old will Christian be in eight years?
Step-by-step reasoning process: If in eight years Brian will be 40 years old, he is currently 40 - 8 = 32 years old. Since Christian is twice as old as Brian, he is 2 * 32 = 64 years old. In 8 years, Christian will be 64 + 8 = 72 years old.
The answer is 72.

Answer the following question.
James drives 30 mph for half an hour and then twice as long for twice the speed. How far did he drive in total?
Step-by-step reasoning process: His first drive was 30 * .5 = 15 miles. The next leg was .5 * 2 = 1 hour. The speed of the trip was 30 * 2 = 60 mph. So he drove 60 * 1 = 60 miles. So in total he drove 60 + 15 = 75 miles.
The answer is 75.

Answer the following question.
Ahmed and Emily are having a contest to see who can get the best grade in the class. There have been 9 assignments and Ahmed has a 91 in the class. Emily has a 92. The final assignment is worth the same amount as all the other assignments. Emily got a 90 on the final assignment. What is the minimum grade Ahmed needs to get to beat Emily if all grades are whole numbers?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Step-by-step reasoning process: Ahmed has scored 819 total points in the class thus far because 9 x 91 = 819. Emily had scored 828 total points before the final assignments because 9 x 92 = 828. She scored 918 total points after the final assignment because 828 + 90 = 918. Ahmed needs to score a 99 to tie Emily for the semester because 918 - 819 = 99. Ahmed needs to score a 100 to beat Emily for the semester because 99 + 1 = 100.
The answer is 100.