book Maths Puzzle Numerical Ability

A solution of ethyl alcohol that is 70% alcohol by weight is to be used as a bactericide. The solution is to be made by adding water to a 95% ethyl alcohol solution. How many grams

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Log(subscript 2)M^6 N^3 Can you show me the steps to get the answer for this problem.--- The problem as follows:

7x+3+10x

Thank you,
Candace