book Maths Puzzle Numerical Ability

Simplify the Following:

5X^2-8X/X^2-9 - 4X+9X^2/X^2-9

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book Other Question

How do you write 33,400,000,000,000,000,000,000 in letters?, not in numbers.

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Deborah Rivera A recipe for 2 1/2 dozen whole sheat muffins requires 600g of flour. How many muffins can be made with 900g of flour?