Question : The average of 25 results is 20. The average of the first 12 results is 15 and that of the last 12 results is 18. Then, the 13th result is:
Option 1: 100
Option 2: 101
Option 3: 104
Option 4: 103
Correct Answer: 104
Solution :
Given: The average of 25 results is 20. The average of the first 12 results is 15 and that of the last 12 results is 18.
The sum of 25 result = (25 × 20) = 500
The sum of the first 12 results = (12 × 15) = 180
The sum of the last 12 results = (12 × 18) = 216
So, the 13
th
result = (500 – 180 – 216) = 104
Hence, the correct answer is 104.
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