3.5 seconds is a(n) string
79.2 is a(n) double
12 is a(n) integer

converting to other data types:
3.5 seconds as a double is 3.5
3.5 as an integer is 3
converting back to a string results in 3

before casting, 98.6 degrees is a string

using type casting instead:
as a double: 98.6
as an integer: 98

after casting, 98.6 degrees is a string