exam Maths Puzzle Numerical Ability

y(2-x)=11

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A bacteria culture started with a count of 480 at 8:00 A.M. and after t hours is expected to grow to f(f)=480(3/2)^t. Estimate the number of bacteria in the culture at noon the same day. The length of a rectangular piece of sheet steel is 2 in. longer than the width. Find the exact diemnsions if the area of the sheet is 168 sq. in.