The average of 13 results is 40. The average of the first seven is 38 and the average of the last seven is 43. What is the seventh result?
A. 47
B. 45
C. 43
D. 51
1 answer
Best answer
Answer: A. 47
Answer: (A) 47
The seventh result is counted in both groups of seven.
Seventh = 7 × 38 + 7 × 43 − 13 × 40 = 266 + 301 − 520 = 47.
Doubtly AI
· 27 Oct 2026
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