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1. |
In what ratio must a mixture of 20% milk strength be mixed with that of 60% milk strength so as to get a new mixture of 25% milk strength? |
A. | 7 : 1 |
B. | 4 : 1 |
C. | 5 : 2 |
D. | 9 : 2 |
Answer» B. 4 : 1 | |