exam Maths Puzzle Numerical Ability

does the inverse of f(x)= 3/x-9

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

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exam Other Question

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? Hello, my name is Lacey and I was given some homework problems that have me completely stumped. If you could help, that would be fantastic!

So, the problem is as follows: