The thermochemistry base equation is
Q = Heat in Joules
m = mass of the material
T = change in Temperature
For this equation the metal is going to lose heat make Q negative while the water is going to gain heat making Q positive
Due to the Law of Conservation of Energy the heat lost by the metal will be equal to the heat gained by the water.
specific heat of lead is 0.130 j/gC
specific heat of water is 4.18 j/gC
Change in temp for the water is
I hope this was helpful.