If 3A = 4B = 6C, find : A : B : C.

If 2a = 3b and 4b = 5c, find : a : c.

Find the compound ratio of 2a : 3b, mn : x² and x : n

If (x + 3) : (4x + 1) is the duplicate ratio of 3 : 5, find the value of x.