In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a velocity of +4.0 m/s, grabs him.

The tackler holds onto the receiver, and the two move off together with a velocity of +3.0 m/s.

The mass of the tackler is 110 kg. Assuming that momentum is conserved, find the mass of the receiver.

in kg.

i tried to solve this like this:

3.0 m/s = m1 * 4.0 m/s divided by 110 kg

and i got 82.5 which is not correct.

please help me with what i've done wrong please.