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How do you solve this physics momentum question?

A boy on a 1.9 kg skateboard initially at rest tosses a(n) 8.6 kg jug of water in the forward direction. If the jug has a speed of 3.1 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.61 m/s, find the boy's mass. Answer in units of kg.

Since the initial momentum is equal to the final momentum (Pi=Pf) then the equation used would be MaVa+MbVb = MaVa+MbVb. But, this problem has 3 masses so i don't know what to do. Can any one help me?

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