Assuming 4,750 is the container with water.
Y=weight of container
X=weight of oil
2X=weight of water
Find Y
(a) x+y=3250
(b) 2x+y=4750
Use substitution method
equation (a)
x+y=3250
x=3250-y
Plug Equation A into B
2(3250-y)+y=4750
6500-2y+y=4750
6500-y=4750
-y=-1750
y=1750
The empty container weighs 1750 grams.