Let the initial amount be X ml.

• Gave 350 ml to neighbour. Remainder = X − 350.
• Used 25% of remainder, so 75% of remainder left.
• 0.75 × (X − 350) = 150
• X − 350 = 150 ÷ 0.75 = 200
• X = 200 + 350 = 550

Final Answer: 550 [NOTE: fraction in question likely garbled; re-verify source]