Question
The average of 8 numbers is 21. If one of the numbers is removed, the average of the remaining 7 numbers becomes 20. What is the value of the number that was removed?
Solution
ATQ, Sum of 8 numbers = 8 × 21 = 168 Sum of remaining 7 numbers = 7 × 20 = 140 Removed number = 168 − 140 = 28
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