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Coding and Decoding · Question 29 of 66

Question 29

MediumOriginal question

In a certain code, CAR is written as 24-26-9. Which word is written as 7-12-15-23 in that code?

Options for question 29

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. C = 24, A = 26, R = 9: these are reverse positions (Z = 1, A = 26), found as 27 minus the position.

  2. To decode, subtract each number from 27: 27−7=2027 - 7 = 20, 27−12=1527 - 12 = 15, 27−15=1227 - 15 = 12, 27−23=427 - 23 = 4.

  3. 20, 15, 12, 4 are T, O, L, D. The word is TOLD.

Worth noting

GLOW reads the numbers as ordinary positions. It is a real word, which makes it tempting, but that reading would code CAR as 3-1-18.

Concept
Decoding a reverse-position code
Typical time
70 s
Your time
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The rule this testsLetters to numbers
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