In a mixture of water and spirit water is 40%. When 25 liter water is added in the mixture percentage of water increased to 60%. Find the quantity of spirit in the mixture. पानी और स्पिरिट के मिश्रण में पानी 40% है जब मिश्रण में 25 लीटर पानी मिलाया जाता है तो मिश्रण में पानी का प्रतिशत बढ़कर 60% हो जाता है। मिश्रण में स्पिरिट की मात्रा ज्ञात कीजिये।

Let initial mixture = 100 liters. Water = 40 liters, Spirit = 60 liters. After adding 25 liters water: total = 125 liters, water = 65 liters. Given water becomes 60%: 65/125 = 52%, not 60%. Let initial mixture = x liters. Water = 0.4x, Spirit = 0.6x. After adding 25L water: water = 0.4x + 25, total = x + 25. Given (0.4x + 25)/(x + 25) = 0.60. Solving: 0.4x + 25 = 0.6x + 15, so 10 = 0.2x, x = 50. Spirit quantity = 0.6 × 50 = 30 liters, which is option D.