CA Foundation P3 · Chapter 1 · Question 8 of 9
If log₄ x = 2.5, then x is equal to:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) 32
Explanation
log₄ x = 2.5 means x = 4^2.5 = (2²)^2.5 = 2⁵ = 32. The value 10 comes from multiplying 4 by 2.5, and 16 and 64 are 4² and 4³ respectively.
More Ratio and Proportion, Indices and Logarithms MCQs
- Q1Two numbers are in the ratio 5 : 8. If 9 is added to each number, the ratio becomes 2 : 3. The two numbers are:
- Q2The duplicate ratio of 3 : 7 is:
- Q3The fourth proportional to 4, 10 and 14 is:
- Q4The mean proportional between 12 and 75 is:
- Q5The value of (xᵃ/xᵇ)^(a+b) · (xᵇ/xᶜ)^(b+c) · (xᶜ/xᵃ)^(c+a) is: