Question 1035519
find the volume relationship between the two objects, the large to the small 
3 ft = 36"
{{{36^3/8^3}}} = 91.125 times the small one
Find the weight relationship.
25 lb = 400 oz
{{{400/10}}} = 40 times the small one; obviously made of different materials
:
40/91.125 = .439 times the cu/inch of the model material is the material of the larger object of have a weight of 25 lb