The average of 20 numbers is 15 and the average of first five is 12. The average of the rest is :
[A]13
[B]14
[C]15
[D]16

16
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.