Study the given pattern carefully and select the number that can replace the question mark (?) in it.
First row: 13, 1, 70
Second row: 9, 9, 90
Third row: 11, ?, 130
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding/deleting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 15.
Logic: (First number + Second number) × 5 = Third number
First row: 13, 1, 70 → (13 + 1) × 5 = 70
Second row: 9, 9, 90 → (9 + 9) × 5 = 90
Third row: 11, ?, 130 → (11 + ?) × 5 = 130 → 11 + ? = 26 ⇒ 15