Can You Solve this - 7 = 42 | 6 = 30 - with Answer

Can you solve this??

7 = 42
6 = 30
5 = 20
3 = ?

ANSWER
6 is the Answer

Explanation
7 = 42
=> 7 x 7 = 49
49 - 7 = 42

6 = 30
=> 6 x 6 = 36
36 - 6 = 30

5 = 20
=> 5 x 5 = 25
25 - 5 = 20

Therefore,
3 = 6
=> 3 x 3 = 9
9 - 3 = 6