Discussion
In a certain code, '256' means 'red colour chalk', '589' means 'green colour flower' and '254' means 'white colour chalk'. The digit in the code that indicates 'white' is :
Answer: B
'White' is coded as 4.
'256' (red colour chalk) and '254' (white colour chalk) share 2 and 5, which stand for 'colour' and 'chalk'. The digit that differs, 4 in place of 6, must stand for the word that differs, 'white' in place of 'red'.
'589' also contains 5 with 'colour', confirming that 5 is 'colour' and 2 is 'chalk'. 8 belongs to 'green' or 'flower'.
Coding-decoding questions like this are solved by comparing codes that share words: common words map to common digits.
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