exam Maths Puzzle Numerical Ability

Write without negative exponents.
(3x^-4y^2)^-3

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exam Other Question

Solve the following equation

x-(9x/x- 2) = (-10/x - 2) A nut mixture contains 10% cashews. How many kilograms of the mixture and how many kilograms of cashews should be mixed to give 6 Kg of a nut mixture which is 25% cashews?