You need to prepare 180g of a 10% cream using 30% stock cream and a cream base. How much is needed for each

Answer 1

You want to dilute the 30% cream by a factor of 3 so if you take 60 g of the 30% stuff and add cream base (120g) you should have it.
c1v1 = c2v2
180*10 = 30*v2
v2 = 180*10/30 = 60 g of the 30%.