SAT Math Practice Question #28169 - SATify | SATify

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SAT Math Practice Question #28169 - SATify | SATify

#28169

algebra

logarithms

Change of Base

medium

120 sec

What is the value of $a$ for which $\frac{1}{lo g _{3} a} + \frac{1}{lo g _{5} a} + \frac{1}{lo g _{7} a} = 1$ ?

A.

35

B.

70

C.

105

D.

120

E.

210