Any ideas how to approach this problem?

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Correct answer is 5 I think

It is the top value added to (bottom value times second to bottom value)

For row 2

15*2=30+4=34

For row 1

21 times 1 +?=26

?=5
It's just a math riddle. There are apps for them that can help you practice abstract thinking
The approach to this olympiad level problem is getting on my nerves. Is the rule applicable to row and column? Is there a general way to solve these type of poblems?
4\*5+2=22

15\*2+4=34

1\*21+x=26

x=5

**A.** 5

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