In what ratio must a mixture of 30% alcohol strength be mixed with that of 50% a

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In what ratio must a mixture of 30% alcohol strength be mixed with that of 50% alcohol strength so as get a mixture of 45% alcohol strength ?

Options:

A . 1 : 2

B . 1 : 3

C . 2 : 1

D . 3 : 1

Answer: Option B

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