Cube magic

• A cube object 3" * 3" * 3" is painted with green in all the outer surfaces. If the cube is cut into cubes of 1"*1"*1", how many 1" cubes will have at least one surface painted?
  
  For answer of this Puzzle read my next POST.........
  

• Answer of 'Work Funda':
  
  A & B can separately do a piece of work in 10 & 15 days respectively. They work together for sometimes and B stops. If A completes the rest of work in 5 days, then B has worked for how many days ?
  
  And right answer is :
  
  B has worked for 3 (Three) days.