book Maths Puzzle Numerical Ability

A coffee filter for a new coffee maker is to be designed using a conical filter. The filter is to be made from a circle or radius 10cm with a sector cut from it such that the volum

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The formula is 1020 squre root of P(1-.01square root of P)=G. P is the population in thousands,this formula is the amount of water in gallons per minute the city needs.
A city Hi Tutors:
Please help me put this word problem into Algebra form and solve.

Area of Rectangle. The width of a rectangle is fixed at 16yd. For what lenghts will the area be at