On page 323, it showed that Ares wasn't sure of the answers that Percy was asking him. Ares is a god of war, so everything he does, he does in full confidence, however in this case he struggles to answer the question.
Mass- triple beam scale
Volume- graduated cylinder
Density- find the mass and the volume of the object. Divide the mass by the volume.
Hope this helps!
Answer:
1. the houses need to be better
2. our stores
3. our streets
4. our fountains or decorations