First Solve @wasimur
Wasimur had a $2$ digit number $x$. Gourab interchanged the digits and found another number $y$. Then Gomuj came and said "Hey look, $(x+y)$ and $(x-y)$ both are square numbers". Wasimur and Gourab were astonished by the fact.Now, if $x>y$ then what is the value of $(2y-x)$?