book Maths Puzzle Numerical Ability

48 ≥ 4x(x-1)

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An investor decides to invest some cash in an acount paying 13% annual interest, and to put the rest in a stock fund that ends up earning 7% over the course of a year. The investor Two air ducts remove 525ftcubed of air per minute. The larger duct removes 45ftcubed of air less than twice the amount of air removed by the smaller duct. How much is removed by e