Quantitative Aptitude • Ratio, Average & MixtureMedium
What is the mean proportional between 1 and 64?
A. 9
B. 16
C. 8✓ Correct Answer
D. 32.5
💡 Solution & Explanation
The mean proportional between two numbers a and b is √(a × b). Here √(1 × 64) = √64 = 8. Check: 1 : 8 = 8 : 64, because 1 × 64 = 8 × 8 = 64. The average (32.5) is a different idea.
More Quantitative Aptitude Ratio, Average & Mixture questions
- What is the mean proportional between 8 and 72?
- The ages of A and B are in the ratio 5 : 6. After 9 years, the ratio of their ages will be 44 : 51. What is…
- A 360-litre mixture contains milk and water in the ratio 7 : 3. How many litres of water must be added to…
- A container holds 60 litres of milk. 12 litres are taken out and replaced with water. This is done once more.…
- A container holds 100 litres of milk. 10 litres are taken out and replaced with water. This is done once…