50% of A = \( \frac{1}{25} \) of B → \( \frac{A}{2} = \frac{B}{25} \).

• 25A = 2B → B = 12.5A = \( \frac{25A}{2} \)
• B − A = \( \frac{25A}{2} - A = \frac{23A}{2} \)
• A : (B − A) = A : \( \frac{23A}{2} \) = 1 : \( \frac{23}{2} \) = 2 : 23

Final Answer: 2 : 23