Arrange the following ratios in ascending order: 3 : 4, 3 : 5, 2 : 11, 7 : 2

The ratio of the number of students in schools A, B and C is 4 : 5 : 6. If the number of students in the schools is increased by 10%, 12% and 20%, respectively, then find the new ratio of the number of students in the schools A, B and C.

Four numbers are in the ratio 2 : 3 : 4 : 6 and their sum is 1440. Find the ratio between the sum of the first and fourth numbers and the sum of the second and third numbers.