Logarithm Question — Solved Example with Shortcut & Explanation

Step-by-step solution. Logarithm for UPSC CDS/OTA.

Topic

Logarithm

Subject

Mathematics

Difficulty

Medium

Solve Time

45-60 sec

Solved UPSC CDS/OTA Question

A solved UPSC CDS/OTA PYQ - decoded step-by-step.

Solve it the standard way once - then learn the shortcut.

Q · LogarithmMedium · 45s

TopicLogarithm

Question Typemultiple choice

DifficultyMedium

Marking+1 / −0.33

Test Duration30 min

Step-by-Step Solution

Every step explained - no skipped algebra.

(75/35) × (49/25) × (x/105) × (25/13) = 1

⇒ x = 13

Final Answer: Option B - 65

Logarithm (Mathematics) Solved Question