book Maths Puzzle Numerical Ability

23 - 5(3 - n) = -4(n - 2) + 9n

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book Other Question

Employees of a discount appliance store receive an additional 20% off of the lowest price on an item. If an employee purchases a dishwasher during a 15% off sale, how much will he Simplify: (-3a^2b^-2)^2 / (5a^3)^2

Thanks guys for your help, this is a huge help