Question
The average of forty numbers is 45 while the average of
first twenty-two numbers and last twenty-two numbers is 50 and 60, respectively. Find the twenty-second term.Solution
ATQ,
Sum of forty numbers = (40 × 45) = 1800
Sum of the first twenty-two numbers = (22 × 50) = 1100
Sum of the last twenty-two numbers = (22 × 60) = 1320
So, twenty-second term = 1100 + 1320 - 1800 = 620
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