Answer:
Mr. devito needs to buy 40 packs 
Step-by-step explanation:
Given:
Total number of fourth grade students = 118
The number of pencils in one pack = 6
The number pencil each student gets   =2
To find:
The number of packs of pencils that is to be bought  = ?
Solution:
To give all the 118 fourth grade students each 2 pencils , the total number of pencils needed will be 
 = >  
=>  236 Pencils
We know that a pack contains 6 pencils, so the number of pack that has to be bought , in order to have 236 pencils will be
=> 
On substituting the values
=> 
=> 39.33
=> 40