Quantitative Aptitude • Ratio, Average & MixtureMedium
The average of 5 numbers is 67. When one more number is added, the average becomes 69. What is the number added?
A. 79✓ Correct Answer
B. 69
C. 10
D. 71
💡 Solution & Explanation
Total of the 5 numbers = 5 × 67 = 335. Total of all 6 numbers = 6 × 69 = 414. The new number is the difference: 414 − 335 = 79. Shortcut: new number = new average + (old count × rise in average) = 69 + 5 × 2 = 79.
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