book Maths Puzzle Numerical Ability

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3(4-x)+5x=9

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If Cos A = 3/5 and A is in the first quadrant, find cos 2A. A and B are 30km apart. If they leave at the same time and travel in the same direction, A overtakes B in 60 hours. If they walk toward each toher, they meet in 5 hours. What ar