AP ICET 10 Sep 2020 Shift 2 Paper

Note
The 26 letters of English are given ranks 1.2__26.in the alphabetical order. Then for 1≤r≤26,rth letter is coded as kth letter where 7r+3=26M+k‌where‌0≤k≤25 and M E Z. When k = 0, kth letter is coded as ‘z’. For example the letter 'E ' is coded as *L’ because when r = 5 and 7r + 3 = 38, then k =12 and 12th letter is 'L'. For decoding the reverse process is used. Based on this answer the questions