Coding and decoding

Written by Bilal Siddiqui (Logical Reasoning)

MDCAT · Logical reasoning · 11 questions

Name: ____________________ Date: ____________

If CAT is written as DBU in a code, how is DOG written in the same code?
- A EPG
- B EPH
- C CNF
- D EOH
If A = 1, B = 2, C = 3 and so on, what is the sum of the code values for the word BED?
- A 11
- B 14
- C 12
- D 9
If MANGO is written as NBOHP, how is APPLE written in the same code?
- A CQQNG
- B BPPMF
- C BQQMF
- D BQQLF
In a code, 2 stands for 4, 3 stands for 9 and 4 stands for 16. What does 6 stand for?
- A 18
- B 36
- C 12
- D 24
How is the word LOGIC written when its letters are written in reverse order?
- A CIGLO
- B CIGOL
- C LOGIC
- D CGIOL
In a code, A is written as Z, B as Y and C as X, so each letter is replaced by its mirror letter. How is CAB written?
- A ZYX
- B XYZ
- C XZY
- D YXZ
In a certain code, + means multiply, - means add, and x means subtract. What is the value of 4 + 3 - 2?
- A 12
- B 9
- C 14
- D 10
In a certain language, red is called blue, blue is called green and green is called yellow. What would the colour of grass be called?
- A Blue
- B Green
- C Red
- D Yellow
If CAT is coded as DBU, how is DOG coded?
- A EPH
- B ENH
- C EPG
- D DPH
If A = 1, B = 2, C = 3 and so on, what is the sum of the letters in the word BAD?
- A 6
- B 9
- C 8
- D 7
In a certain code, 2 means 'add', 5 means 'subtract'. What is the value of 8 2 3 5 4 using the code, read from left to right?
- A 7
- B 15
- C 9
- D 1

Answer key

1. B, 2. A, 3. C, 4. B, 5. B, 6. C, 7. C, 8. D, 9. A, 10. D, 11. A

Each letter moves one place forward in the alphabet. D becomes E, O becomes P and G becomes H.
B = 2, E = 5 and D = 4, and 2 + 5 + 4 = 11.
Each letter moves one place forward. A, P, P, L, E become B, Q, Q, M, F.
Each number is squared, so 6 stands for 36.
Reading the letters of LOGIC from the end gives C, I, G, O, L.
C becomes X, A becomes Z and B becomes Y, which gives XZY.
Replacing the signs gives 4 x 3 + 2. That is 12 + 2 = 14.
Grass is green, and green is called yellow in this language.
Each letter moves one place forward: D to E, O to P, G to H.
B = 2, A = 1, D = 4, and 2 + 1 + 4 = 7.
8 + 3 = 11 and 11 − 4 = 7.