CA Foundation · Quantitative Aptitude · Ratio and Proportion, Indices and Logarithms
If the sub-duplicate ratio of x : 25 is equal to 3 : 5, then x equals:
x equals 9. The sub-duplicate ratio of x : 25 is √x : 5, and equating it to 3 : 5 gives √x = 3. Squaring both sides gives x = 9.
- A9Correct
- B15
- C45
- D3
Explanation
Sub-duplicate ratio of x : 25 is √x : 5. Setting √x : 5 = 3 : 5 gives √x = 3, so x = 9. Option 2 results from forgetting to square.
Did you get it right without looking?
One question tells you little. A timed set on Ratio and Proportion, Indices and Logarithms shows your real accuracy, how long you take and where you lose marks.
More Ratio and Proportion, Indices and Logarithms questions
- The value of log₂₅ 125 is:
- If a^x = b, b^y = c and c^z = a, where a, b, c are positive and different from 1, then the value of xyz is:
- If log₃ (x − 2) + log₃ (x + 6) = 2, then the value of x is:
- If x varies directly as y and inversely as z, and x = 6 when y = 4 and z = 2, then the value of x when y = 9 and z = 6 is:
- If log₃ 5 = a, then log₉ 25 expressed in terms of a is:
- If log₂ x = a, log₄ y = a and x, y > 0, with a ≠ 0, then the relation between x and y is: