There is a fraction, the denominator plus 1 equals 1 / 2, the denominator minus 1 equals 3 / 5?

There is a fraction, the denominator plus 1 equals 1 / 2, the denominator minus 1 equals 3 / 5?

The molecules have not changed
Molecule: (1 + 1) / (2 / 1-5 / 3) = 6
Denominator: 6 × 2-1 = 11
6/11