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

Sequence: 3, 5, 9, 17, 31; each step: 3→5→9→17→31.

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

First letters: E-v-e-r-y → EVERY; the hidden message is EVERY.

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

They meet after 100/(2+3) = 20 seconds; A has traveled 2×20 = 40 meters from their start.

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

ABCD means four distinct letters with no repeats; LOVE has four unique letters, while THAT, TREE, and NOON have repeated letters.

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

A palindrome ABCBA means digit 5 = digit 1 = 3, digit 4 = digit 2; with digit 3 = 7 the structure is A_7_A, so last two digits are 7 then 3.

Codebusters Test Practice Test

Codebusters Test Practice Test

Codebusters Test Codebusters Logical Puzzles and Riddles 5