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1. |
In what ratio must a mixture of 15% spirit strength be mixed with that of 25% spirit strength to get a mixture of 21% spirit strength? |
A. | 1 : 3 |
B. | 2 : 3 |
C. | 3 : 4 |
D. | 4 : 5 |
Answer» C. 3 : 4 | |