Arithmetichard · Past Paper
The ratio of third proportional to 12 and 30 and the mean proportional between 9 and 25 is:
A5:1
B1:5
C75:15
Da and c both
✓ Correct Answer: D — a and c both
Third proportional (12, 30): 30^2/12 = 900/12 = 75. Mean proportional (9, 25): sqrt(9*25) = 15. Ratio 75:15 = 5:1. Both are correct.
Share this question
More from Arithmetic
- The ratio of the base and height of a triangle is 3:4 and its area is 96 sq. cm. Find the height.
- At what rate of compound interest will Rs 2000 become Rs 2662 in 1.5 years if interest is compounded half-yearly?
- Express 0.01 as a percentage.
- What is the ratio of the area of a square to the area of the square drawn on its diagonal?
- Find the value of x if 10% of x is 50.