Question
The average of 27 numbers is 20.The average of first 13
numbers is 15 and that of the last 13 numbers is 18. What will be the 27th number?Solution
Sum of 27 numbers = 27 × 20 = 540 Sum of first 13 numbers = 13 × 15 = 195 Sum of last 13 numbers = 13 × 18 = 234 Therefore, 27th number = 540 – (195 + 234) = 111
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