What is 0.21212121... as a fraction???

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.