300 200
20 30
+ 4 + 1
---------
Answer: The answer is C
Step-by-step explanation: Just did it in a quiz
Number of books = 42 / 5/8 (Note 3 1/2 feet = 42 ins.)
= 42 * 8/5 = 336 / 5 = 67.2
67 books will fit on the shelf.
There rate is 1.67 or 1.66 repeated a day