book Maths Puzzle Numerical Ability

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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

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Two pipes simultaneously function to fill a tank in 12 hours.If one pipe takes 10 hours less than the other ,find the time taken by the two pipes. Can someone help me understand this please?

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