The average of 21 results is 20. The average of the first 10 is 17 and the average of the last 10 is 21. What is the 11th result?
A. 36
B. 44
C. 40
D. 20
1 answer
Best answer
Answer: C. 40
Answer: (C) 40
Total = 21 × 20 = 420. First 10 = 170, last 10 = 210.
11th result = 420 − 170 − 210 = 40.
Doubtly AI
· 27 Oct 2026
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