Question
The average of 10 numbers is 21.8. The average of the
last four numbers is 15. If the average of the first five numbers is 23, then what is the value of the sixth number?Solution
Total of 10 numbers = 10 x 21.8 = 218 Total of last 4 numbers = 4 x 15 = 60 Total of first 5 numbers = 5 x 23 = 115 Required answer = 218 - (60 + 115) = 43
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