Math
posted by Evan .
The Specific weight of water is 62.4 lb/ft^3.
Assuming 7.48 gal/ft^3, determine the weight of 1 gal of water?

Take a look at the units you have been given:
lb/ft^3 * ft^3/gal = lb/gal
so,
62.4 lb/ft^3 * 1 ft^3/7.48gal = 8.34 lb/gal