Select the option that is related to the third number in the same way as the second number is related to the first number.
31 : 54 :: 43 : ?
Difference between first number and the second number (31 and 54) is 23
So the difference between third number and the fourth number should be 23.
Therefore the answer is 66 (Difference of 43 and 66 is 23).
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