If the average of two numbers is XY and one number is X, the other number is 2XY - X. This is found by first multiplying the average by 2 to get the sum (2XY), then subtracting the known number (X) from that sum to isolate the unknown number.
The average of two numbers is XY. If one number is equal to x. the other number is equal to _________ ?
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Question context
This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the Punjab Police preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.