exam Maths Puzzle Numerical Ability

How many liters of pure acid must be mixed with 20 liters of a 15% acid solution to get 20% mixture?

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exam Other Question

I hope this time the problem is more clear. Thanks for your help!

5a^2-20 (a^3+2a^2) (9a^3+6a^2)
_______ / ______ * _______

3a^2-12a (2a^2-8a)
For the equation , perform the following:
a) Solve for all values of x that satisfies the equation.
Answer:

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b) Graph the functions and