21. If a person reads two chapters a day, each with 6 pages, and there are a total of 798 pages, how many days will it take to finish reading?
Answer: C
It will take 66 1/2 days to finish reading.
Reading two chapters a day, each consisting of 6 pages, totals 12 pages per day. To find out how many days it takes to read 798 pages, we divide 798 by 12, resulting in 66.5 days.
A) 133 days
Option A is incorrect because if a person reads 12 pages per day, it would take significantly less time to complete 798 pages. Calculating 798 pages at this rate shows that 133 days is not feasible.
B) 399 days
Option B is also incorrect. This option suggests a reading rate that is far too slow, as completing 12 pages a day would never extend the reading duration to 399 days for 798 pages.
C) 66 1/2 days
This is the correct answer. When dividing the total number of pages, 798, by the daily reading rate of 12 pages, the result is 66.5 days, confirming that this option accurately reflects the time needed to finish reading the book.
D) 75 1/2 days
Option D is incorrect because it overestimates the time required to read 798 pages at a rate of 12 pages per day. This calculation does not align with the derived total from the given reading pace.
Conclusion
The correct answer is 66 1/2 days, derived from dividing the total pages by the daily reading rate. All other options miscalculate the time based on the established reading parameters, demonstrating a misunderstanding of the reading pace required to complete the text.