Solution:
Since the set P is equal to the set Q, thus P=Q, it means all the elements in P is in Q and all the elements in Q is also in P. So you simply have to find which element is in P but not in Q.
P={4,8,12,16,20}
Q={16,4,12,k,20}
Since the elements of P are arranged from the smallest to the largest, let's arrange Q too as well
⇒Q={4,k,12,16,20}
P={4,8,12,16,20}
As you can see the missing element (k) in Q is 8
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