Select the option that is related to the fifth number in the same way as the second number is related to the first number, and the fourth number is related to the third number.
10 : 110 :: 7 : 56 :: 9 : ?
(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 /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: A
Explanation
The correct answer is option 1 i.e. 90
Logic: (1st number + 1) × 1st number = 2nd number
10 : 110 → (10 + 1) × 10 = 11 × 10 = 110
7 : 56 → (7 + 1) × 7 = 8 × 7 = 56
Similarly, 9 : ? → (9 + 1) × 9 = 10 × 9 = 90