To determine how long it will take Carla to read the entire 20 pages, we first find out how long it takes her to read a single page.
Given that it takes her 10 minutes to read 4 pages, we can calculate the time per page:
\[ \text{Time per page} = \frac{10 \text{ minutes}}{4 \text{ pages}} = 2.5 \text{ minutes per page} \]
Now, we multiply the time per page by the total number of pages she needs to read:
\[ \text{Total time to read} = 20 \text{ pages} \times 2.5 \text{ minutes per page} = 50 \text{ minutes} \]
Thus, it will take Carla 50 minutes to read the full assignment.
The correct response is:
50 minutes