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?

In what ratio must a mixture of 15% spirit strength be mixed with that

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

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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?

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