exam Maths Puzzle Numerical Ability

Find the denominator after simplifying: {4+1/(x-2)}/{3-1/(x-2)}

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As many 8-cm diameter discs as possible are cut from a sheet of rectangular cardboard measuring 170 cm by 90 cm. Find the area of the sheet that is left.

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Two airplanes travel toward each other from cities that are 780km apart at rates of 190km/h and 200 km/h. They started at the same time. In how many hours will they meet?