The rent is shared based on usage. Usage is measured by the number of cows multiplied by the number of months.
A's usage =11×5=55 cow-months
B's usage =9×4=36 cow-months
C's usage =15×6=90 cow-months
Total usage =55+36+90=181 cow-months
The rent is shared in the ratio of their usage:
A : B : C =55:36:90
A's share =₹1210 and A gets 55 parts.
55 parts =₹1210
1 part =551210
1 part =₹22
C gets 90 parts.
C's share =90×22
C's share =₹1980
Therefore, C's share is ₹1980.