Container A = 75% of B = \(\frac{3}{4}\)B.
Container B = \(\frac{1}{3}\) of (A + C) [assuming fraction is 1/3, not 1/75].
So A + C = 3B.

• C = 3B − A = 3B − \(\frac{3}{4}\)B = \(\frac{9}{4}\)B
• Original ratio A : B : C = \(\frac{3}{4}\) : 1 : \(\frac{9}{4}\) = 3 : 4 : 9

B increases by 50%: new B' = 1.5B.
• New ratio A : B' : C = 3 : (4 × 1.5) : 9 = 3 : 6 : 9 = 1 : 2 : 3

Final Answer: 1 : 2 : 3