exam Maths Puzzle Numerical Ability

The length of a rectangular playing field is 5ft less than teice its width.If the perimeter of the playing field is 230ft,find the length and width of the field.

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a bacteria culture started with a count of 480 at 8am and after t hrs is expected to grow to f(t)=480(3/2)t. estimate the number of bacteria in the culture at noon the same day degrees in a six sided convex polygon