exam Maths Puzzle Numerical Ability

(~A -> ~C)
~(B . ~C)
(~B -> (T v S)) /:.(~T -> (~S -> A))

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Please help me with this proof.

In the figure, angle NYR and angle RYA form a linear pair, angle AXY and angle AXZ form a linear pair, and angle RYA and angle AXZ are congruent. a tank holds 80 liters of a chemical solution. currently, the solution has a strenght of 30%. how much of this solution must be drained and replaced with a 70% solution to get a strenght of 40%?