book Maths Puzzle Numerical Ability

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Jane has 400 feet of lumber to frame a rectangular patio (the perimeter of a rectangle is 2 times length plus 2 times width). She wan

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Susan had $108 (in thousands) invested in three different mutual funds in a certain year. She earned a return of 12% on the first fund, a return an airplane flew for 4.23 hours with a 25.5-km/h tail wind. the return flight against the same wind took 4.97 hours. find the speed of the plain in still air.