Solved UPSC CDS/OTA Question
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Q · Average Medium · 45s
5 yr ago, the average age of Rashmi and Surbhi was 20 yr. Now, the average age of Rashmi, Surbhi and Meeta is 30 yr. What will be the age of Meeta after 15 yr?
TopicAverage
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.
Total age of Rashmi and Surbhi (5 yr ago)
= 20 × 2 = 40 yr.
Total age of Rashmi and Surbhi (At present) = 40 + 5 + 5 = 50 yr.
Total age of Rashmi, Surbhi and Meeta (At present) = 30 × 3 = 90 yr
∴ Present age of Meeta = 90 – 50 = 40 yr
∴ Age of Meeta after 15 yr
= 40 + 15 = 55 yr
Final Answer: Option B — 55 yr