Answer:
6 nights
Step-by-step explanation:
Because it takes one night for Mavin to finish 2/3 of a book, you can create a ratio of book:night.
2/3:1
4:x
Then we solve for x.
x=4x * 1/ 2/3
x = 4 * 3/2
x = 6
So it will take Mavin 6 nights to finish his 4 books :)
