Discussion

If F=6 and JOY=50 then the code for 'OBSERVE' is

Answer: A

The code for OBSERVE is 86.

Each letter is coded by its position in the alphabet, and a word by the sum. Check: F = 6, and JOY = 10 + 15 + 25 = 50. So

\[ \begin{aligned} \text{OBSERVE} &= 15 + 2 + 19 + 5 + 18 + 22 + 5 \\ &= 86 \end{aligned} \]

76, 66 and 56 are each 10 less than the next, the result of slips in adding up the seven letters.

Checking the given examples first (F = 6 confirms simple alphabet positions) is the quickest way to find the coding rule.

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