In a college, the number of students studying English is 600 and the number of students studying Economics is 1/3 of studying English. If the total number of students studying English increased by 25% and the number of students studying Economics decreased by 10%, Find the ratio between them.
1
10 : 21
2
7 : 20
3
25 : 6
4
More than one of the above
5
None of the above