Head of a whale is six feet long-Math riddle

55.Math Riddles

The head of a whale is six feet long; his tail is as long as his head and half his body, and his body is half of his whole length. How long is the whale?

48 48

Explanation :  

The length of the fish is 48"

Let x = length of fish
 
Then, ½x = length of body
            6 + (½)(½x) = 6 + ¼x = length of tail
 
Length of fish = length of head + length of body + length of tail
 
x = 6 + ½x + 6 + ¼x
 
x = 12 + ¾x
 
¼x = 12
 
x= 48"