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Coding and Decoding · Question 31 of 66

Question 31

MediumOriginal question

In a certain code, LAMP is written as 16-13-1-12. How is DESK written in that code?

Options for question 31

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. L = 12, A = 1, M = 13, P = 16. The code 16-13-1-12 lists these from the last letter to the first.

  2. So the code reverses the word and writes each letter's position.

  3. DESK reversed is KSED: K = 11, S = 19, E = 5, D = 4, giving 11-19-5-4.

Worth noting

4-5-19-11 forgets to reverse. 16-8-22-23 uses reverse positions of KSED, a rule that would code LAMP as 11-14-26-15.

Concept
Reversal combined with letter positions
Typical time
70 s
Your time
—
The rule this testsLetters to numbers
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