Hard chemistry problem!!?

a solution is .10 M in both Zn and Ni. If carbonate ion is added slowly with negligible dilution, which cation will precipitate first as the carbonate solid? What percent of the zinc [Zn^2+] will remain unprecipitated when NiCO3 first starts to precipitate? Ksp=1.4x10^-11 for ZnCO3 and Ksp=6.6x10^-9 for NiCO3