Select the option that is related to the first number in the same way as the fourth number is related to the third number and sixth number is related to fifth number.
(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 /subtracting /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)
23 : ? :: 77 : 145 :: 545 : 1081
Show answer & explanation
Correct answer: A
Explanation
23 : ? :: 77 : 145 :: 545 : 1081
Just as
77 : 145
77 × 2 − 9 = 154 − 9 = 145
and
545 : 1081
545 × 2 − 9 = 1090 − 9 = 1081
Rule:
New number = (Old number × 2) − 9
Similarly
23 : ?
23 × 2 − 9 = 46 − 9 = 37