book Maths Puzzle Numerical Ability

Maude and Matilda each have a bank CD. Maude's is $1500 larger than Matilda's, but the interest rate is 1% less. Last year Maude received interest of &780, and Matilda received $

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factor by grouping with complete solution
1. x² - y² - x -y
2. x³ - y³ - x² + 2xy - y²
3. x² + xy - 2y² - x³ + y³ OPEN-ENDED describe a situation that you can model with the equation: m divided by 5 = 4