Help please!!!?

a 0.350 kg block at -27.5 c is added to 0.217 kg of water at 25.0 c. they come to equilibrium at 16.4 c. what is the specific heat of the block?
Update: a 0.350 kg block at -27.5 c is added to 0.217 kg of water at 25.0 c. they come to equilibrium at 16.4 c. what is the specific heat of the block? water/c=4186 j/(kg*C)
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