Answer:
and 
Step-by-step explanation:
Given
per section
Required
Model the scenario
The model of this scenario is:
This gives:
<em />
<em> -- This represents the multiplication model</em>
Divide both sides by 18
Reorder
<em /><em> -- This represents the division model</em>
AG=1 => BG=3 => CG=sqrt3 => CD = 2sqrt3 => perimeter = 3*CD= 6sqrt3
Divide the total by the quantity of numbers:
852/3 = 284
Because there are an odd quantity of numbers (3) the answer is the middle number.
The answer is 284
