Correct Answer - Option 2 : 21
The logic is:
First diagram: 9 × 13 + 13 = 130
Second diagram: 14 × 9 + 9 = 135
Similarly,
Let the missing number is x.
Third diagram: 7 × x + x = 168
⇒ 8x = 168
⇒ x = 168 ÷ 8
⇒ x = 21
Hence, ‘
21’ is the correct answer.