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Question : The average of 15 results is 21. The average of the first 7 of those is 21 and the average of the last 7 is 20. What is the 8th result?

Option 1: 25

Option 2: 31

Option 3: 28

Option 4: 22


Team Careers360 12th Jan, 2024
Answer (1)
Team Careers360 18th Jan, 2024

Correct Answer: 28


Solution : The average of 15 results is 21, which means the sum of all 15 results is 15 × 21 = 315.
The average of the first 7 results is 21, which means the sum of the first 7 results is 7 × 21 = 147.
The average of the last 7 results is 20, which means the sum of the last 7 results is 7 × 20 = 140.
So, the 8th result = Sum of all 15 results – Sum of first 7 results – Sum of last 7 results
= 315 – 147 – 140
= 28
Hence, the correct answer is 28.

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