Ametal stand specifies a maximum load of 450 lb. will it support an aquarium that weighs 59.5 lb and is filled with 37.9 l of seawater (d = 1.03 g/ml)?

Yes, metal stand will easily support the aquarium filled with 37.9  liters of seawater.

Explanation:

Maximum load taken by the metal stand = 450 lb

Load exerted by the aquarium filled with sea water :

Mass of an empty aquarium = 59.5 lb

Mass of sea water = m

Volume of sea water ,v= 37.9 L = 37900 mL

Density of the sea water = d = 1.03 g/mL

1 lb = 453.592  g

Total load exerted by filled aquarium = 86.062 lb + 59.5 lb = 145 .56 lb

450 lb > 145 .56 lb

Yes, metal stand will easily support the aquarium filled with 37.9  liters of seawater.