Quantitative Aptitude • Ratio, Average & MixtureMedium
The average of 14 numbers is 50. When one more number is added, the average becomes 53. What is the number added?
A. 42
B. 53
C. 95✓ Correct Answer
D. 56
💡 Solution & Explanation
Total of the 14 numbers = 14 × 50 = 700. Total of all 15 numbers = 15 × 53 = 795. The new number is the difference: 795 − 700 = 95. Shortcut: new number = new average + (old count × rise in average) = 53 + 14 × 3 = 95.
More Quantitative Aptitude Ratio, Average & Mixture questions
- An amount of ₹8,550 is shared among P, Q and R in the ratio 2 : 1 : 6. How much does R get?
- What is the average of the first 51 odd numbers?
- In what ratio must wheat costing ₹41 per kg be mixed with wheat costing ₹59 per kg, so that the mixture is…
- The ages of A and B are in the ratio 5 : 6. After 4 years, the ratio of their ages will be 17 : 20. What is…
- The ages of A and B are in the ratio 2 : 3. After 10 years, the ratio of their ages will be 9 : 11. What is…