# Quantitative Aptitude – Equation – An encryption system operates as follows

## XAT 2021 Exam Paper – Quantitative Aptitude – Equation – An encryption system operates as follows

Q. 12. An encryption system operates as follows: Step 1. Fix a number k (k≤26).
Step 2. For each word, swap the first k letters from the front with the last k letters from the end in reverse order. If a word contains less than 2k letters, write the entire word in reverse order.
Step 3. Replace each letter by a letter k spaces ahead in the alphabet. If you cross Z in the process to move k steps ahead, start again from A.
Example: k = 2: zebra –> arbez –> ctdgb.
If the word “flight” becomes “znmorl” after encryption, then the value of k:

1. 5
2. Cannot be determined uniquely from the given information
3. 4
4. 6
5. 7

Solutions:
Given, Flight become znmorl . From the options all values are more than 3.
So Let’s assume K > 3.
So flight will become thgilf -> znmrol. Hence the value of k will be 6

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