Hello Diya
Answer is 9;10;11
Take the numbers as
n-1
n
n+1
Now according to given condition
( n+1)^2 - ( n-1)^2 + 60 = n^2
(n+1+n-1) *( n+1-n+1) +60 = n^2
4*n +60 = n^2
So
n = 10
Good luck.