exam Maths Puzzle Numerical Ability

Use elimination to solve: x/2+2y=9
2x-y=18

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The intensity I of a television signal varies inversely as the square of the distance d from the transmitter. If the intensity is 25W/m^2 at a distance of 2km, what is the intensit An ox is tied to a pole with a 10 m long rope. The ox moves keeping the rope tight. Find the area of the ground swept by the rope