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 · AgeDifficult · 45s
The present age of a mother is 3 times that of her daughter. After 15 years, the mother will be twice the daughter's age. Find the daughter's present age.
TopicAge
Question Typemultiple choice
DifficultyDifficult
Marking+1 / −0.33
From TestChapter Test 1 (Chapter Test)
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
Let the daughter's current age be D. Then the mother's current age is 3D.
After 15 years:
Daughter’s age = D + 15
Mother’s age = 3D + 15
Given: 3D + 15 = 2(D + 15) → 3D + 15 = 2D + 30 → D = 15
Daughter’s present age is 15 years.
Final Answer: Option C - 15