Answer:
Megan thinks she can fit all 
 boxes into 
 trucks, and her estimate incorrect as to fit all 
 boxes, 
 trucks are needed.
Explanation:
It is given that each truck can hold 
 boxes, and Megan needs to ship 
 boxes total.
The number of trucks that can hold 
 boxes will be,

So, 
 trucks will hold, 
 boxes.
To hold the remaining 
 boxes, one more truck will be needed.
So, in total, 
 trucks are needed to ship 
 boxes.
Megan thinks she can fit all 
 boxes into 
 trucks, so her estimate incorrect.