AP ICET 10 Sep 2020 Shift 1 Paper

Note:
In a certain code, ${\mathit{n}}^{\mathit{t}\mathit{h}}$ letter of the English alphabet is called as ${\mathit{r}}^{\mathit{t}\mathit{h}}$. where n+12 =26m+r such that m and r are integers and 0 ≤ r ≤ 25 and when r=0.
${\mathit{r}}^{\mathit{t}\mathit{h}}$ letter is treated as ‘z ’. For example the 5th letter E is coded as ${17}^{\mathit{t}\mathit{h}}$ letter Q. N as Z and R is coded as D. The reverse process is used for decoding.
Use these to answer questions