Question

A box of Q pounds is given to Sanjay, Raj and David. They divided it equally amongst themselves. Then Sanjay gives Raj M pounds, Raj gives David 2M pounds and David gives Sanjay 3M pounds. Afterwards, Sanjay has exactly half of all the pounds initially given to the three people. In terms of M, how much money was originally given to Sanjay, Raj and David.