Question

4+4=20 5+5=30 6+6=42 7+7=56 then what about 9+9=

Answer 1

90 is the answer.
4^2+4=20
5^2+5=30
6^2+6=42
7^2+7=56
9^2+9=90

Answer 2

4+4 = 20

5+5 = 30

6+6 = 42

7+7 = 56

9+9 = 90

The reason is that in every no such as
4+4 one no is added with 1 so it becomez
4+5 hence both are multipied so the answer comes out to be 20.

Same rule is applied in others.

Hence answer is 90