The Gothic element there is the horror that ensues after he hears the tapping. The character is alone during a spooky, dreary night, nobody found anywhere, and suddenly there is a mysterious tapping by someone, and it turns out that no-one tapped, which means either madness or ghosts, that are either way both elements of Gothic writing.
Gulliver has come to love the Houyhnhnms, their society, and their way of living
15+25+35+45=120 120 divide 4 = 30
The living conditions were awful, and the employer can make you work for fewer wages. The employer can as well make you work more hours.Women and children were working. Just because the factories were booming doesn't mean the living conditions were right.Everyone was living close together and more diseases developed.