isi-entrance 2014 Q2

isi-entrance · India · solved Laws of Logarithms Express One Logarithm in Terms of Another
If $\log_{12} 18 = a$, then $\log_{24} 16$ equals
(A) $\dfrac{8 - 4a}{5 - a}$ (B) $\dfrac{4a - 8}{a - 5}$ (C) $\dfrac{4 + 8a}{5 + a}$ (D) None of these
(A) $\dfrac{8-4a}{5-a}$
If $\log_{12} 18 = a$, then $\log_{24} 16$ equals

(A) $\dfrac{8 - 4a}{5 - a}$ \quad (B) $\dfrac{4a - 8}{a - 5}$ \quad (C) $\dfrac{4 + 8a}{5 + a}$ \quad (D) None of these