HackerRank Coding and Decoding Quiz- 1

Each letter in the word is moved three steps forward to obtain the corresponding letter of the code.

The first, third, fifth and seventh letters of the word are each moved one step backward; the second, fourth, and sixth letters are moved one, two and three steps forward respectively to obtain the corresponding letters of the code.

Each letter of the word is five steps ahead of the corresponding letter of the code.

A = 1, B = 2, ….., Z = 26.
So, CHILD = 3+8+9+12+4 = 36.

Putting A = 1, B = 2, C = 3, ….. X = 24, Y = 25, Z = 26, we have:
COBRA → C/O/B/R/A → 3/15/2/18/1 → 3152181
GORILLA→ G/O/R/I/L/L/A → 7/15/18/9/12/12/1 → 71518912121

Let A = 1, B = 2, C = 3, ……, X = 24, Y = 25, Z = 26
Then, M = 13 = 1 + 3 = 4;
O = 15 = 1 + 5 = 6;
B = 2; I = 9;
L = 12 = 1 + 2 = 3
T = 20 = 2 + 0 = 2;
Y = 25 = 2 + 5 = 7
So, MOBILITY = 46293927.
Similarly, X = 24 = 2 + 4 = 6; N = 14 = 1 + 4 = 5.
So, EXAMINATION = 56149512965

Jet will fly in the sky. But Jet is called Sonic. So, Sonic is the correct answer.

B = 2 A = 1 D = 4

Similarly B = 2 A = 1 N = 14

Every nth letter from A to Z will be nth letter of Z to A in new code.
So answer is (b)

A ⇒ 1, B ⇒ 2 , … , J⇒ 1+0=1, K⇒ 1+1=2,......Y⇒ 2+5=7, Z⇒ 2+6=8.
So answer is (c)