Question
The average of 27 numbers is 25.The average of first 13
numbers is 16 and that of the last 13 numbers is 19. What will be the 27th number?Solution
Sum of 27 numbers = 27 × 25 = 675 Sum of first 13 numbers = 13 × 16 = 208 Sum of last 13 numbers = 13 × 19 = 247 Therefore, 27th number = 675 – (208 + 247) = 220
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