Look at three squares horizontally, look at six numbers, and then

The first number plus the sixth number equals the fourth number;

The second number plus the fifth number equals the third number; that is

6+3=9

5+ 1=6

Add up to 69

1+2=3

4+2=6

It adds up to 63.

1+7=8

8+ 1=9

It adds up to 98.

Then the number at the question mark should be 98.