Question : The average of 8 numbers is 18. If one of the numbers is excluded, the average becomes 20. Find the excluded number.
Option 1: 6
Option 2: 10
Option 3: 8
Option 4: 4
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Correct Answer: 4
Solution :
An average of 8 numbers = 18
So, the sum of the 8 numbers = 8 × 18 = 144
If one number is excluded, then
the sum of the 7 numbers = 7 × 20 = 140
Excluded number = 144 – 140 = 4
Hence, the correct answer is 4.
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