Answer: It will take him 27 days
Explanation:
First we do 4 ÷ 3 to find out how many bars per day.
Then we get 1.33333 so we do 36 ÷ 1.33333 to get our final answer of 27
(You could try multiplying 1.33333 with a of different numbers until you get the right one, but this way is a lot easier)