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 · Mixture and AlligationMedium · 45s
A can contain a mixture of two liquids A and B in the ratio 7:5. When 9 liters of mixture is replaced by liquid B, the ratio becomes 7:9. Find the quantity of liquid A in the original mixture.
TopicMixture and Alligation
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Apply mixture and allegation concepts to solve the problem.
Final Answer: Option C — 35 liters