Please help solving this math problem ! It's easy , but ... I'm still a noob. :

Two cylinders A and B have the same shape ( the ratio of the height to diameter is the same for both ) , but cylinder A has twice the volume of cylinder B .

Quests :

a - Show that the ratio of the diameter of A to the diameter of B is

b - Show that the height of cylindre A is roughly 26% greater than the height of cylinder B .

c - Show that the diameter of cylinder B is roughly 79% of the diameter of cylinder A .

d - If the diameter of cylinder B is 151 mm , then find the diameter of A .

Thank u so much in advance !!!