exam Maths Puzzle Numerical Ability

Peter received commissions of $150 and $225. How much be receive from a third sale so his total commission will exceed $500?

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Simplify: y(to the power of 60) + y(to the power of 45) / y(to the power of 15)

Answer: y(to the power of 30)(y(to the power I have lawn beds 20 inches wide, by turning up the edges to form right angles. Find the depth that will maximize its cross-sectional area and allow the greatest amount of water to flow. What is the maximum cross-sectional area?