How long will Jennifer take to finish reading the book?

How long will Jennifer take to finish reading the book?

• A. 12 days
• B. 7 days
• C. 9 days
• D. 15 days

Answer: (A)

The key idea is that time needed equals how much reading there is to do divided by how fast you read. If Jennifer has a fixed number of pages to read and she also reads a fixed number of pages each day, you find the days by dividing the total pages by the pages per day. Doing that with the problem’s numbers gives 12 days, so that’s why 12 is the answer. If she read more per day, it would take fewer days; read less, and it would take more.

The key idea is that time needed equals how much reading there is to do divided by how fast you read. If Jennifer has a fixed number of pages to read and she also reads a fixed number of pages each day, you find the days by dividing the total pages by the pages per day. Doing that with the problem’s numbers gives 12 days, so that’s why 12 is the answer. If she read more per day, it would take fewer days; read less, and it would take more.