book Maths Puzzle Numerical Ability

I have a problem with this problem, 16-x squared/ x cubed-2x squared-8x

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book Other Question

. A boat travels at the speed of 20 Miles per hour in still water. It travels 48 miles up stream, and then returns to the starting point in a total of five hours. The speed of the current is ____ miles per hour. 5x^2y(x-y^2)(x^2+xy^2+y^4)