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| 1. |
Two years ago, the age of A was three times the age of B. If B is currently 9 years old, then after how many years, the age of A will be double the age of B? |
| A. | 2 years |
| B. | 3 years |
| C. | 4 years |
| D. | 5 years |
| Answer» E. | |