Directions: Read the following information carefully and answer the question. Seven brothers M, N, O, P, Q, R and S are of different ages, but not necessarily in the same order. S is younger than R. N is older than O. Four brothers are older than S. Q is not the youngest. R is older than O, but younger than P. Q and M are younger than O. Only one person was born between N and O. If N is 4 years older than O and M is 21 years old, what could be the age of P? (The age of the all the persons is in whole numbers)

Arranging the clues from oldest to youngest gives the order P, R, N, O, Q, M, S. Since N is 4 years older than O and M is 21, and M is older than S, we know S is at most 20 years old. Because N is older than O, and R is older than N, and P is older than R, the age of P must be strictly greater than 25. Therefore, P must be at least 29 years old if all ages are whole numbers.

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