53 + 38 = 91
15 plus 38 is 53
53
- 20 - 38 - (-53) = -58 + 53 = -5
6 hours and 31 minutes
33 hours and 31 minutes
91 - 38 = 53
129
38 + 15 = 53 38 - 15 = 23
244
57 + 57 + 38 + 38 = 190
(53/38 x 100) - 100 = 39.473684210526315789 recurring (that is, 39.473684210526315789473684210526315789...) percent.
129