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Question

Quantitative Aptitude Question on Logarithms

If log45=(log4y)(log65)log_45=(log_4y)(log_6\sqrt5),then yy equals

Answer

log45=(log4y)(log65)log_45=(log_4y)(log_6\sqrt5)

log45log65=log4y⇒ \frac{log_45}{log_6\sqrt5} = log_4y

log45×log65=log4y⇒ log_45×log_6\sqrt5 = log_4y

2(log45)(log56)=(log4y)⇒ 2(log_45)(log_56) = (log_4y)

2log46=log4y⇒ 2log_46 = log_4y

log462=log4y⇒ log_46^2 = log_4y

log436=log4y⇒ log_436 = log_4y

y=36⇒ y = 36