15/64
Edit: Just to show the steps used to get to the final answer... 27/64 - 3/16 = 27/64 - 12/64 = 15/64 Snakester1962 (Supervisor)
64 subtracted by 48 = 16
By 25% I'm guessing of the number 64, so it is 64-16, which is 48.
64 subtracted from 289 = -225
64 subtracted from 18 = 46
27/64 is the simplest form.
3
27 and 81
1, 3, 9, 27 1, 2, 4, 8, 16, 32, 64
equivalent to 16 over 64 = 8/32, 4/16, 1/4
64 is a multiple of 16, and 81 is a multiple of 27, so I'd say that 36 is the odd one out.
27 is not a perfect square
36/64 = 9/16