If you tried to smuggle gold bricks by filling your backpack, whose dimensions are 66 cm 18 cm 15 cm, what would its mass be

Answer 1

Assume your backpack volume is 66*18*15 cm^3. Multiply that by the density (or specific gravity) of gold, which is 19.3 g/cm^3. The answer will be in grams. Convert that to kg or lb if you wish.

http://www.reade.com/Particle_Briefings/spec_gra.html