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 · Average Medium · 45s
The average of 7 data is 34 and the average of the first three data is 28 and the average of next two data is 47. Find the average of the last two data?
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.
Sum of 7 data = 34 X 7 = 238
Sum of first three data = 28 X 3 = 84
Sum of next 2 data = 2 X 47 = 94
Sum of last 2 data = 238 - 84 - 94 = 60
So, average of last 2 data = 60/2 = 30
Final Answer: Option B — 30