Milk and water are mixed in a vessel A as 5:3 and in vessel B as 1:5. For vessel C, if one takes equal quantities from A and B, find the ratio of milk to water in C?

In vessel A, ratio milk:water = 5:3, so milk = 5/8, water = 3/8. In vessel B, ratio milk:water = 1:5, so milk = 1/6, water = 5/6. Taking equal quantities from A and B: Total milk = 5/8 + 1/6 = (15+4)/24 = 19/24. Total water = 3/8 + 5/6 = (9+20)/24 = 29/24. Therefore ratio milk:water = 19:29. Option D (17:31) is incorrect, Option C (19:31) has wrong water value, Option A (17:31) is also incorrect.