Among seven people F, G, H, K, L, M and N, each has a different age. Only two people are older than M. Only two people are younger than K. The age of K is a multiple of 10. The youngest is 12 years old. F is the eldest. N is older than L, but younger than H. L is not the youngest. The sum of the ages of the youngest and second oldest person is 42 years. What can be the possible age of L?

Youngest = 12

2nd oldest = 30 (since 12 + 30 = 42)

F is oldest → F = 1st

M is 3rd oldest → Rank 3

K is 3rd youngest → Rank 5, age = 20 (multiple of 10)

H > N > L

L is not youngest → L ≠ 12

This order:
F, H(30), M, N, K(20), L(?), G(12)

L is 2nd youngest, so age is between 12 and 20 → 15