7/24
15/24 - 8/24 = 7/24
It's 1/24.
Twenty five minus one third is 24 and 2/3. You may have also meant twenty five minus one third of twenty five. That would be 16 and 2/3.
24
128/24 - 117/24 = 11/24
15/24 - 8/24 = 7/24
One third !
7/8 - 1/3 = 21/24 - 8/24 = 13/24 (thirteen twenty-fourths)
1500 minus one third is 1499 2/3
one and one-third
One third is three ninths. So one ninth minus three ninths is minus two nights.