log x (16/25) = -1/2, then x is? 625 / 256 256 / 625 526 / 265 None of these ? l

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Home ‣ Aptitude ‣ Logarithm Comments

Question
log _x (16/25) = -1/2, then x is?
Options
A. 625 / 256
B. 256 / 625
C. 526 / 265
D. None of these

Correct Answer

625 / 256

Explanation

? log_x(16/25) = -1/2
? 16/25 = (x)^-1/2 = 1/x^1/2
? x = 625/256

Logarithm problems

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1.
If log ₁₀₀₀₀x = -1/4, then x is?
Options
A. 1 / 100
B. 1 / 10
C. 1 / 20
D. None of these

Discuss

Correct Answer: 1 / 10

Explanation:

? log₁₀⁴x = -1/4
? x = (10⁴)^-1/4
= 1/10

2.
The value of log ₆ log ₅ 15625 is?
Options
A. 1
B. 2
C. 3
D. None of these

Discuss

Correct Answer: 1

Explanation:

log₆ log₅15625 = log₆ log₅(5)⁶
= log₆6(log₅5) = 1

3.
The value of log ₁₀ (0.00001) is?
Options
A. - 5
B. - 6
C. - 7
D. None of these

Discuss

Correct Answer: - 5

Explanation:

Exp. = log₁₀ 10^-5 = -5

4.
The value of log ₁₀ 0.000001 is?
Options
A. 6
B. - 6
C. 5
D. - 5

Discuss

Correct Answer: - 6

Explanation:

Exp. = log₁₀ 10^-6 = -6

5.
The value of 25 log ₅ 4 is?
Options
A. 16
B. 5
C. 25
D. None of these

Discuss

Correct Answer: 16

Explanation:

Exp. = 25 log₅4 = 5² log₅4
= 5 log₅ 4²
= 16

6.
The value of log ₂ (1/64) is?
Options
A. 6
B. - 6
C. 7
D. None of these

Discuss

Correct Answer: - 6

Explanation:

log₂(1/64) = log₂1 - log₂ 2⁶
= 0 - 6 = -6

7.
If log _a 3 = 1/3, then value of a is?
Options
A. 27
B. 81
C. 72
D. None of these

Discuss

Correct Answer: 27

Explanation:

? log_a3 = 1/3
? 3 = (a)^1/3
? a = 27

8.
If log ₁₀ x = 7, then value of x is?
Options
A. 1010
B. 107
C. 710
D. None of these

Discuss

Correct Answer: 107

Explanation:

log₁₀x = 7
? x = 10⁷

9.
If p ^x = q, then?
Options
A. logp x = q
B. logx q = P
C. logp q = x
D. logq P = x

Discuss

Correct Answer: logp q = x

Explanation:

? p^x = q
? log_pp^x = log_pq
? xlog_pp = log_pq
? x = log_pq (?log_pp = 1)

10.
Given that log ₁₀ 2 = 0.3010 the value of log ₁₀ 5 is?
Options
A. 0.3241
B. 0.6911
C. 0.6990
D. 0.7525

Discuss

Correct Answer: 0.6990

Explanation:

log₁₀5 = log₁₀(10/2)
= log₁₀10 - log₁₀2
= 1-0.3010
= 0.6990

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log x (16/25) = -1/2, then x is?

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log _x (16/25) = -1/2, then x is?