Question 1155201
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Hi,
 *[illustration rectangular_solid.png].
Rectangular Prism
h = 6in
l = 2x
w = x
Surface = 2lw + 2lh + 2wh
208 = 2*x*2x + 2*2x*6 + 2*x*6
208 = 4x^2 + 24z + 12x 
52 =  x^2 + 6x + 3x 
x^2 + 9x -52 =0
(x-4)(x+13)=0  x = 4  disposing of negative solution
Volume = Length X Width X Height
V = 8*4*6 = 192in^3 
Wish You the Best in your Studies.