exam Maths Puzzle Numerical Ability

How many liters of pure alcohol need to be added to seven liters of 21% alcohol solution to produce a mixture which is 44.7% alcohol?

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exam Other Question
3log_5(3x+1)-2log_5(2x-1)-log_3x does the inverse of f(x)= 3/x-9

become f^-1(x) = 3+9x/x