exam Maths Puzzle Numerical Ability

Mixing water and antifreeze: How much water should be added to i gallon of pure antifreeze to obtain a solution that is 60% antifreeze?

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Translate the following into a quadratic equation and solve it: The length of a rectangular garden is three times its width; if the area of the garden is 75 square meters, what are its dimensions? Tutor can you help me with this math problem?* Thanks

Given f(x)=1-5x and g(x)=x^2-3 find the composite function (fog)(x) and simplify