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| 1. |
A solution prepared by a chemist, in which the volume of water is 30% of the total volume. After pouring 5 liters of water in this solution, it was observed that the volume of water has increased to 40%. How many liters was the water in the initial solution? |
| A. | 35 |
| B. | 30 |
| C. | 14 |
| D. | 9 |
| Answer» E. | |