Exam Maths Puzzle Area and Volume

What are the dimensions of a rectangle whose area is 60 sq ft?

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Exam Other Question

Bsis of a percentage amount.

Example -:
394,019.13 x 4% = 15,760.76

If I start out with the 15,760.76 what do I need to do to get to the basis which is 394,019.13? How do you factor out the 12 in
X = -12 +/- 12 times the square root of 15i divided by 24.