Question

Ardit has 8 chapters of a book left he reads two thirds of a chapter a day how many days does it take to finish the book

Answer 1

12 days

8 / (2/3)

or 

it takes 3 days to read 2 chapters so 
3 X 4 = 12

Answer 2

12 days

2/3 chapter---------------1 day
1 chapter--------------------x

2/3 x =1x1
Multiply both sides by 3
2x=3
X= 1.5
1 chapter ---1.5 days
8 chapters 1.5x8 = 12