Question
The average of 13 numbers is 10.The average of first 6
numbers is 8 and that of the last 6 numbers is 10. What will be the 13th number?Solution
Sum of 13 numbers = 13 × 10 = 130 Sum of first 6 numbers = 6 × 8 = 48 Sum of last 6 numbers = 6 × 10 = 60 Therefore, 13th number = 130 – (48 + 60) = 22
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