exam Maths Puzzle Numerical Ability

How many liters of a 40% solution of HCI are added to 2000 liters if a 20% solution to obtain a 35% solution?

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I really need some major help on this one. I figured out the first problem, which my answer is 1/2, but I am stuck on the rest.
f(x)=x/x+1 and g(x)=1/x^2+2x+1, find (a)f(1)+g(1) a five times the diffrence of a number and one yields the same result as twice the same number increase by three