exam Maths Puzzle Numerical Ability

Solution A is 80% Alcohol and Solution B is 50% Alcohol. How many Liters of each solutions should be mixed in order to make 100 Liters of a solution that is 68% alcohol?

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exam Other Question

Find the square root. Assume that all of the variables represent positive real numbers of the radical

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My problem is: Find the inverse of the function f(x)=log(base2)(x-3)+7; using algebra. State the domain and range of both functions.
I understand the the base of a logarithm is an