Discussion

In a certain code language 'RISE' is written as '8419', and 'MEAL' is written as '5927'. How is RAIL written in that code ?

Answer: C

RAIL is written as 8247.

Each letter has its own digit, in the same position. From RISE = 8419 and MEAL = 5927:

\[ \begin{aligned} R &= 8,\ I = 4,\ S = 1,\ E = 9 \\ M &= 5,\ A = 2,\ L = 7 \end{aligned} \]

E is 9 in both words, which confirms the letter-by-letter rule. So RAIL is R, A, I, L = 8, 2, 4, 7, that is 8247.

8429 swaps A and I and ends in E's digit, 8124 uses S's digit for A, and 8412 puts the digits in the wrong order.

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