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1. |
In a bag the ratio of red balls to green balls is 4 : 9. If 6 more green balls were added to the bag, the ratio of red balls to green balls would become 1 : 3. How many red balls are there in the bag? |
A. | 9 |
B. | 10 |
C. | 8 |
D. | 12 |
Answer» D. 12 | |