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.