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Study the given pattern carefully and select the number that can replace the question mark (?) in it.

\(\begin{array}{*{20}{c}} 9&{}\\ {}&{130}\\ {13}&{} \end{array}\;\;\;\begin{array}{*{20}{c}} {14}&{}\\ {}&{135}\\ 9&{} \end{array}\;\;\;\begin{array}{*{20}{c}} 7&{}\\ {}&{168}\\ ?&{} \end{array}\)


1. 11
2. 21
3. 19
4. 15

1 Answer

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Best answer
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.

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