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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book Other Question
give an example of a function that has many values in the domain and only one element in the range. I need to find the solpe of a line parallel to each line.
1.y=2x-3