Question

numerator is 2 less than denominator of a rational number F1 is subtracted from numerator and denominator both genuine rational number obtained is 1 upon 2 what is the rational number

Answer 1

let the denominator be x
then the numerator will be x-2.

ATQ
x-2-F1/x-F1=1/2

after this do cross multiplication.
equalise both sides.
then you will get your answer