Specific Gravity and antifreeze

[mcs117]

Homework Statement

If 5.0L of antifreeze solution (0.8 specific gravity) is mixed with 4L of water to make a 9.0 L mixture. what is the specific gravity of the mixture?

Homework Equations

SG = density of substance / density of water

The Attempt at a Solution

I am confused as in how to gain the density from the substance gravity. Is it given that the density is 1 g/cm^3 for water?

 

[Shooting Star]

Use CGS system -- there the specific gravity is numerically equal to the density in gm/cc.
1 L = 1000 cc = 1000 mL.