exam Maths Puzzle Numerical Ability

Subtract and Simplify

((2-y)/(y-4))-((9y-4)/(4-y))

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exam Other Question

Could you please help me with my problem?

Solve the equation
square root x-2=1 Mr. Johnson has 11 quarts of punch that is 16% lemonade. He wants to makee some punch containing 52% lemonade. How much lemonade should he add?