Answer/Step-by-step explanation:

To solve the problem, we need to use the given information to find out how long it takes Evan to read one sci-fi book. Once we know that, we can use it to calculate how long it would take her to read 50 sci-fi books.

We are told that Evan can read 4 sci-fi books in 10 hours. Therefore, her reading rate is 4 books per 10 hours, or 0.4 books per hour.

To find out how long it takes her to read one sci-fi book, we can divide 1 book by her reading rate:

1 book / 0.4 books per hour = 2.5 hours per book

So, Evan can read one sci-fi book in 2.5 hours.

To find out how long it would take her to read 50 sci-fi books, we can multiply the time it takes her to read one book by the number of books:

50 books x 2.5 hours per book = 125 hours

Therefore, it would take Evan 125 hours to read 50 sci-fi books assuming they are all the same length.

i hope it helps :))