Simple calculation of 17 / 24 - (4 / 5-7 / 24)
17/24—(4/5—7/24)
=17/24-4/5+7/24
=1-4/5
=1/5
4 / 7 + (17 / 24-4 / 7) (off formula)
4 / 7 + (17 / 24-4 / 7)
=4 / 7 + 17 / 24-4 / 7
=4 / 7-4 / 7 + 17 / 24
=17 out of 24