In a certain code language, 'GAS' is written as '54', and 'JOG' is written as '49'. How will 'ZIP' be written in that language?

Let's check the sum of positional values of opposite/reverse alphabet letters:The reverse position value of a letter is calculated as $27-(\text{forward position})$.For 'GAS':$G\to 27-7=20$$A\to 27-1=26$$S\to 27-19=8$ Sum $=20+26+8=54$.For 'JOG':$J\to 27-10=17$$O\to 27-15=12$$G\to 27-7=20$ Sum $=17+12+20=49$.For 'ZIP':$Z\to 27-26=1$$I\to 27-9=18$$P\to 27-16=11$ Sum $=1+18+11=30$.