exam Maths Puzzle Numerical Ability

I think i need to multiply the exponents but im not entirely sure.
(3x^2y^3/4x^-2)^3

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exam Other Question

mix a solution that is 60% acid. with a solution that is 100% acid to make 12L of a solution that is 75% acid. How much of each solution should you use? If I was given the equation 5x-4y=20 what would the m= and the b=?
Thank you