self Maths Puzzle

If log10 5 + log10 (5x + 1) = log10 (x + 5) + 1, then x is equal to:

A. 1 B. 3
C. 5 D. 10

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log10 5 + log10 (5x + 1) = log10 (x + 5) + 1

log10 5 + log10 (5x + 1) = log10 (x + 5) + log10 10

log10 [5 (5x + 1)] = log10 [10(x + 5)]

5(5x + 1) = 10(x + 5)

5x + 1 = 2x + 10

3x = 9

x = 3.
9 years agoHelpfull: Yes(1) No(1)

self Other Question

If log10 2 = 0.3010, the value of log10 80 is:

A. 1.6020 B. 1.9030
C. 3.9030 D. None of these
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The value of 1 + 1 + 1 is:
log3 60 log4 60 log5 60
A. 0 B. 1
C. 5 D. 60