Aptitude Hack#76(10-5-19)

Question:

 If 1/8 of a pencil is black ½ of the remaining is white and the remaining 3 ½  is blue find the total length of the pencil?

   A )   7 cm 
   B )   9 cm
   C )   8 cm
   D )   10 cm

Answer: C) 8 cm

Explanation:
Let the total length be x cm

Then black part =x/8 cm

The remaining part= (x-x/8) cm
 =7x/8cm

White part=(1/2 *7x/8) =7x/16 cm

Remaining part=(7x/8-7x/16) =7x/16 cm

7x/16=7/2

x=8cm