Question
The average of twenty numbers is 40 while the average of
first ten numbers and last ten numbers is 48 and 56, respectively. Find the tenth term.Solution
ATQ,
Sum of twenty numbers = (20 × 40) = 800
Sum of the first ten numbers = (10 × 48) = 480
Sum of the last ten numbers = (10 × 56) = 560
So, tenth term = 480 + 560 - 800 = 240
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