Codebusters Test Codebusters Logical Puzzles and Riddles 5

Question 1

A number sequence uses the rule: next term = (previous term × 2) − 1. Starting at 3, what is the 5th term?

Accepted Answer

31

Answer

15

Answer

47

Answer

63

Question 2

A coded message uses a null cipher where the real message is spelled by the first letter of every word. What does 'Every villain enjoys reading yellow elephants' reveal?

Accepted Answer

EVERY

Answer

VERYE

Answer

EVERY again

Answer

EVRYE

Question 3

Two people simultaneously leave opposite ends of a 100-meter bridge. Person A walks at 2 m/s; Person B at 3 m/s. Where do they meet (measured from A's starting end)?

Accepted Answer

40 meters

Answer

50 meters

Answer

60 meters

Answer

33 meters

Question 4

In a cryptogram where word patterns are analyzed, the pattern _ _ _ _ (4 letters, no repeats shown as ABCD) matches the encoded word 'JKLM'. This is most consistent with which plaintext word?

Accepted Answer

LOVE

Answer

THAT

Answer

TREE

Answer

NOON

Question 5

A five-digit number reads the same forwards and backwards (a palindrome). Its first digit is 3 and its third digit is 7. What are the last two digits?

Accepted Answer

73

Answer

37

Answer

77

Answer

33

Question 6

The Atbash cipher maps A↔Z, B↔Y, C↔X, etc. What does the encoded word 'Zokzyr' decode to?

Accepted Answer

APOLLO

Answer

ALPABE

Answer

ALPHAI

Answer

ALASKA

Question 7

A detective puzzle: 5 suspects were each in a different room (A–E) at the time of the crime. The culprit was in an odd-numbered room. Rooms B and D are even-numbered (2 and 4). In which rooms could the culprit be?

Accepted Answer

Rooms A, C, or E

Answer

Rooms B or D

Answer

Room A only

Answer

Rooms C or E only