exam Maths Puzzle Numerical Ability

3a²b³-⅓)(3a²b³+⅓)



(4x-5y²}²



2(3x²-5y³)(2x²-7y³)

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A runner can run 100 yards in 9.8 seconds and 440 yards in 49 seconds. What is the ratio of her average speed in the 440 to her average speed in the 100? Thomas is going to make an open -top box by cutting squares from four coners of an 11 inch by 14 inch sheet of cardboard and folding up the sides. If the area of the base is to be 80 ibches, then what size square should be cut from each corner?