ABC26GN2058 · Logarithms

Subject: General Aptitude · Chapter: Logarithms · Exam: · Marks: · Difficulty:

If $\log _{10} x+\log _{10} 5=2$, then $x$ equals
(a)15
(b)20
(c)25
(d)100
Answer
Answer (as printed): B
Explanation
$$\begin{aligned} \log _{10} x+\log _{10} 5=2 & \Rightarrow \log _{10} 5 x=2 \\ & \Rightarrow 5 x=10^{2}=100 \Rightarrow x=20 . \end{aligned}$$

Explanation as extracted from the printed page; notation may be imperfect.

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