84/264 = 42/132 = 21/66 = 7/22
No.
132/240 = 11/20
9/132 = 3/44
31/42 is already simplified
Yes.
It is: 36/42 = 6/7 simplified
It is: 42/100 = 21/50 simplified
Yes, it can be simplified and the simplest form of 16 over 42 is 8 over 21.
4/9
31/66
42/65 cannot be simplified further.