exam Maths Puzzle Numerical Ability

Express to a positive exponent then find its value

(2/3)^-2

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exam Other Question

16/3y = 12/5

The slash is a fraction symbol. WHich of the following determinants correctly expresses one of the unknown in the solution of the given equation.
x+y+z=6
x-y+z=2
x+y-z=0