It's about the number of Submarines in the US Navy.
It's about nine-tenths the number of Keys on a Piano.
In other words, 75 is 0.850 times the count of Keys on a Piano, and the count of Keys on a Piano is 1.20 times that amount.(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about seven-tenths the number of Wolves in Yellowstone National Park.
In other words, 75 is 0.7210 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 1.390 times that amount.(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about one-and-two-fifths times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.710 times 75.(2016 figures) (sovereign states recognized by the UN only)
It's about two-thirds the number of Elements on the Periodic Table.
In other words, 75 is 0.6360 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 1.570 times that amount.(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
It's about one-and-three-fifths times the number of Teeth in a Great White Shark's Mouth.
In other words, the count of Teeth in a Great White Shark's Mouth is 0.630 times 75.(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about three-fifths the number of Union Stations in the United States.
In other words, 75 is 0.5560 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 1.80 times that amount.(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)