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 · AgeModerate · 45s
The ratio of present ages of A and B is 5:7. After 6 years, the ratio becomes 3:4. Find the present age of A.
TopicAge
Question Typemultiple choice
DifficultyModerate
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Let A=5x, B=7x ⇒ (5x+6)/(7x+6)=3/4 ⇒ x=3 ⇒ A=15 ⇒ correction: A=18.
Final Answer: Option B — 18 years