Question

the sum of the square of the number and 1 divided by the difference of 1 from the square gives 221 by 220. what is the number​

Answer 1

Let the number be x

According to the question

x^2 +1/x^2 - 1=221/220

220(x^2 +1)=221(x^2 - 1)

220x^2 +220=221x^2 - 221

441=x^2

x^2 =441

x=21

Hence the required number is 21