Question 115
The average of 20 numbers is 15 and the average of first five is 12. The average of the rest is
Solution
Average of 20 numbers = 15
=> Sum of 20 numbers = 20*15 = 300
Average of first five = 12
=> Sum of first five = 5*12 = 60
Numbers remaining = 20 - 5 = 15
Sum of remaining numbers = 300 - 60 = 240
$$\therefore$$ Required average = 240/15 = 16
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