Fix bugs and incorrect logics in Qauntity and its related math functions
#180
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| 1m 4s | |
| 56s | |
| 2m 5s | |
| 1m 4s | |
| 42s | |
| 2m 11s | |
| 1m 0s | |
| 45s | |
| 2m 37s | |
| 1m 8s | |
| 46s | |
| 17m 13s |