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Coding and Decoding · Question 22 of 66

Question 22

EasyOriginal question

In a certain code, ACE is written as 26-24-22. How is BIG written in that code?

Options for question 22

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. A is written 26, C is written 24, E is written 22: letters are numbered from the end, Z = 1, Y = 2, …, A = 26.

  2. A letter's reverse position is 27 minus its position.

  3. B = 27−2=2527 - 2 = 25, I = 27−9=1827 - 9 = 18, G = 27−7=2027 - 7 = 20, so BIG is 25-18-20.

Worth noting

24-17-19 subtracts from 26 instead of 27. Check with A: 27−1=2627 - 1 = 26, which matches the example.

Concept
Reverse alphabet positions (27 − n)
Typical time
40 s
Your time
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The rule this testsLetters to numbers
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Ten questions from Coding and Decoding, at your own pace.

Practise this chapter →

Ten questions from Coding and Decoding, at your own pace.