Question
The average of 19 numbers is 16.The average of first 9
numbers is 13 and that of the last 9 numbers is 15. What will be the 10th number?Solution
Sum of 19 numbers = 19 × 16 = 304 Sum of first 9 numbers = 9 × 13 = 117 Sum of last 9 numbers = 9 × 15 = 135 Therefore, 10th number = 304 – (117 + 135) = 52
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