In a certain code language, '253' means 'books are old', '546' means 'man is old', '378' means 'buy good books'. Which digit stands for 'old'? MCQ with Answer and Explanation

Explanation:
Multipliers are 2, 3, 4, 5; next multiplier is 6. 120×6=720.

Explanation:
From first two, 'are' is common 6. From first and third, 'good' is common 5. From second and third, 'bad' is common 3. Remaining in third is 8 for 'and'.

Explanation:
Each letter is shifted one place forward: T→U, A→B, B→C, L→M, E→F = UBCMF.