Q. The average of 20 numbers is 15 and the average of first five is 12. The average of the rest is:
Answer:
16
Notes: If the average of remaining numbers be x, then
20 $ \times$ 15 = 5 $ \times$ 12 + 15 x
=> 300 = 60 + 15 x
=> 15 x = 300 – 60 = 240
$ => x = \frac{240}{15} = 16$
Hence option [D] is correct answer.