Menu
Home / Arithmetic Aptitude / Logarithm :: Discussion

Discussion :: Logarithm

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

    1
    B.

    3
    C.

    5
    D.

    10

    View Answer

    Workspace

    View Answer

    Answer : Option B

    Explanation :

    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.

Write your comments here:

Be The First To Comment