exam Maths Puzzle Numerical Ability

If you have a 5% solution and a 50 % solution how much of each solution do you need to make 20ml of 30% solution?

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problem set 5.1 #13 page 396

(2/3)^t =9/4

is this how you would do it or am I off?!
2-3^2/ 3-2^

not sure if i'm even on the right track please help
Given X^2+XY+AY^2=B and A=1, B=7, find the x intercepts.