book Maths Puzzle Numerical Ability

(-2)^2-3^2/6 divided by 3(2)^-2
Please solve
Plus what symbol do you put for divided

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book Other Question

How many gallon of milk with 4% butterfat must be mixed with 3 gallons of cream with 20% butterfat to produce milk milk containing 5% butterfat. what is a vairable