THE ANSWER IS BELOW

IT HAS TO BE 18.

8 PLUS 1 = 9

9 TIMES 2 = 18

​THIS PAGE IS JUST FOR FUN WITH A FEW BRAIN TEASERS OR USELESS INFORMATION

WHICH IS THE ONLY NUMBER THAT 

IS TWICE THE SUM OF ITS DIGITS?

A. 18

B. 124

C. 27

​D. THERE IS NO SUCH NUMBER

LIKE I SAID -- USELESS INFORMATION (SMILE)