AP ICET 2017 Shift 1 Paper

Directions for questions 56 to 60
In a certain code, every nth letter in the English alphabet is coded as letter where r is the remainder when $5\mathit{n}+7$ is divided by 26 and $1\le \mathit{r}\le 26$. For example,the 10th letter J is coded as 5th letter E.since $\left(5\times 10\right)+7=57=\left(2\times 26\right)+5$. For decoding the reverse process is followed. Based on this answer the questions 56 to 60.