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The letters L, M, N, O, P, Q, R, S and T in  their order are substituted by nine intergers 1 to 9 but not in that order. 4 is assigned to P. The difference between P and T is 5. The difference between N and T is 3. What is the integer assigned to N ?

Option:
A. 4
B. 5
C. 6
D. 7
Answer: C . 6

Justification:

P = 4 and T - P = 5 → T = 9.
T - N = 3 and T = 9 → N = 6.

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