exam Maths Puzzle Numerical Ability

A rectangular storage container with an open top is to have a volume of 10m^3. The length of the base is twice the width. If material for the base costs $10 per square meter and

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Can someone please help me solve this problem.
Write an equation of a line that passes through point (4,-9) and a slope of -4.
Thank you Are all real integers whole numbers?
Does the set of real numbers correspond to all points on the number line?