Number System

The given series is -- 117, 90, 63, X , 9, -18
Consequtive numbers decreases by 27
Following this pattern, the Missing Number X should decrease by 27 from the previous number.
When we subract 27 to the number before X (i.e 63) we get 63--27=36

The given series is -- 117, 144, 171, X , 225, 252
Consequtive numbers increases by 27
Following this pattern, the Missing Number X should increase by 27 from the previous number.
When we add 27 to the number before X (i.e 171) we get 171+27=198

The given series is -- 112, 143, 174, X , 236, 267
Consequtive numbers increases by 31
Following this pattern, the Missing Number X should increase by 31 from the previous number.
When we add 31 to the number before X (i.e 174) we get 174+31=205

The given series is -- 112, 83, 54, X , -4, -33
Consequtive numbers decreases by 29
Following this pattern, the Missing Number X should decrease by 29 from the previous number.
When we subract 29 to the number before X (i.e 54) we get 54-29=25

The given series is -- 112, 141, 170, X , 228, 257
Consequtive numbers increases by 29
Following this pattern, the Missing Number X should increase by 29 from the previous number.
When we add 29 to the number before X (i.e 170) we get 170+29=199

The given series is -- 112, 87, 62, X , 12, -13
Consequtive numbers decreases by 25
Following this pattern, the Missing Number X should decrease by 25 from the previous number.
When we subract 25 to the number before X (i.e 62) we get 62-25=37

The given series is -- 112, 137, 162, X , 212, 237
Consequtive numbers increases by 25
Following this pattern, the Missing Number X should increase by 25 from the previous number.
When we add 25 to the number before X (i.e 162) we get 162+25=187

The given series is -- 112, 133, 154, X , 196, 217
Consequtive numbers increases by 21
Following this pattern, the Missing Number X should increase by 21 from the previous number.
When we add 21 to the number before X (i.e 154) we get 154+21=175

The given series is -- 112, 89, 66, X , 20, -3
Consequtive numbers decreases by 23
Following this pattern, the Missing Number X should decrease by 23 from the previous number.
When we subract 23 to the number before X (i.e 66) we get 66-23=43

The given series is -- 112, 135, 158, X , 204, 227
Consequtive numbers increases by 23
Following this pattern, the Missing Number X should increase by 23 from the previous number.
When we add 23 to the number before X (i.e 158) we get 158+23=181