In two containers the ratio of milk and water are 7:4 and 6:5. If the solution of both containers are mixed in the ratio of 1:1 in the third container, then find ratio of milk and water in the third container?

Container 1 has milk:water in ratio 7:4, so out of 11 parts, 7 are milk, 4 are water. Container 2 has ratio 6:5, so out of 11 parts, 6 are milk, 5 are water. When we mix equal quantities (1:1 ratio), let's say we take 11 units from each container. Total milk = 7 + 6 = 13 units. Total water = 4 + 5 = 9 units. Therefore, the final ratio of milk:water in the third container is 13:9. Option D is correct.