In the analogy "4 is to 20 as 5 is to ?", what should replace the question mark?

In the analogy "4 is to 20 as 5 is to ?", what should replace the question mark?

Explanation

The relationship between 4 and 20 is that 20 is 5 times 4.

Similarly, to find the number that corresponds to 5 in the same way, multiply 5 by 6:

4×5=20

5×6=30

Thus, 5 is to 30 in the same way that 4 is to 20.