Question
The average of 10 numbers is 102. The average of the
first 5 numbers is 78 and the average of the last 4 numbers is 46. What is the 6th number?Solution
Total sum of 10 numbers = 10 × 102 = 1020 Sum of first 5 numbers = 5 × 78 = 390 Sum of last 4 numbers = 4 × 46 = 184 According to question, => 1020 – (390 + 184) = 446
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