exam Maths Puzzle Numerical Ability

Divide.

x^2-25y^2/5x^2+25y divided by (x^2-5xy)

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exam Other Question

x+4)^(3/4) times (x+3)^(-2/3) minus (x+3)^(1/3) times (x+4)^(-1/4) all divided by [(x+4)^(3/4)]^2 how do you simplify this fraction? How many quarts of a pure solution must be added to a 5% solution to get 4 quarts of a 14.5% solution?
Find equation(s) and solve.
Not out of text book!