exam Maths Puzzle Numerical Ability

Can you please explain?

Divide:
2x2 + 5x - 12 � 2x2 - 7x + 6
9x2 - 16 3x2 - x - 4

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exam Other Question

Write as a fraction. Reduce to lowest terms.

35% Identify the rate in the statment " 260 is 52% of 500."

I believe it is 500,am I right?