Quantitative Aptitude • Ratio, Average & MixtureMedium
The average of 12 numbers is 47. When one more number is added, the average becomes 49. What is the number added?
A. 73✓ Correct Answer
B. 51
C. 49
D. 24
💡 Solution & Explanation
Total of the 12 numbers = 12 × 47 = 564. Total of all 13 numbers = 13 × 49 = 637. The new number is the difference: 637 − 564 = 73. Shortcut: new number = new average + (old count × rise in average) = 49 + 12 × 2 = 73.
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