exam Maths Puzzle Numerical Ability

Hello, I need help solving the following problem:

(25x^2y^3-8xy^2+15x3y)/(10x^2y^3)

Thank you very much.

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exam Other Question

I want to know if this problem is correct:

(y-2/3)^2 = 49

y - 2/3 = + or - Square root 2/3

If y - 2/3 = 2/3 then y = 4/3

If y - 2/3 = -2/3 then y = 0

Is this solution correct the way it is worked out? How can I made the any number pie chart with 12 factors instead of 10?