Age Issue

• Mrs. Blair has four children, there names are Andy, Grant, Mark, and Crag.
  
  Facts:
  
  Two years ago, Andy was twice the age of Mark.
  
  Four years ago, Grant was twice the age of Mark.
  
  Two years from now, Andy would be twice the age of Crag.
  
  Three years ago, Mark was twice the age of Crag. Mrs. Blair's current age is the sum of all her children's current age. Now find all five people Age?
  
  
  Visit my next post for the right Answer of this Question:
  
  
  
  
• Right Answer of last asked Question is here..........
  
  
  Water tank has three inlet pipes and one outlet pipe. One inlet pipe A takes 2 hours to fill the tank. Another inlet pipe B takes 3 hours to fill the tank. The third inlet pipe C takes 4 hours to fill the tank. The outlet pipe D empties the whole tank in 12 hours. If the tank is initially empty, how long would it take to fill the tank if all the inlets and outlet pipes are fully in operation?
  
  1 Hour to fill the Water Tank but How to???.....Let's Calculate
  
  

  The rates for the pipes are as under:

  Pipe A = 1/2 tank per hour
  Pipe B = 1/3 tank per hour
  Pipe C = 1/4 tank per hour
  Outlet Pipe D = -1/12 tank per hour

  1 full tank = rate x time
  1 = (1/2+1/3+1/4-1/12) time
  time = 1 hour

  Therefore, Water Tank completely fill after 1 hour.