12 is related to 61 following a certain logic. Following the same logic, 15 is related to 76. To which of the following is 18 related, following the same logic?
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying 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. 91.
12 is related to 61 → 12 × 5 + 1 = 61
15 is related to 76 → 15 × 5 + 1 = 76
Similarly, 18 is related → 18 × 5 + 1 = 91