If the expression \(Q \div O - K + D\) and \(N \div M - Q @ L\) is true, which of the following is definitely true?

M is the sister-in-law of D
N is the son of L
L is the mother of O
Q is the brother-in-law of D
N is the son of K

Correct answer: Q is the brother-in-law of D

Solution

The coded relations indicate family links between the persons. From the first expression, Q is connected to O, K, and D in a way that makes Q the brother-in-law of D. The other options are not definitely established from the given information.

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