Question

What concentration of Ag+ is in equilibrium with 3.0×10−6 M Co(CN)3−6 and Ag3Co(CN)6(s)?

Answer 1

.................Ag3Co(CN)6(s) ==> 3Ag^+ + [Co(CN)6]^3-

I..................solid..........................0................0
Ksp = (Ag^+)^3[Co(CN)6]^3-
The problem tells you [Co(CN)6]^3- = 3.0E-6 M.
Plug that into Ksp expression and solve for (Ag+). You can find Ksp value online.
Post your work if you get stuck.