exam Maths Puzzle Numerical Ability

Find the length of the major and minor axes of an ellipse with the equation 16x2 + 25y2 + 32x - 150y = 159

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let f(X)=x/6 , x=1,2,3,zero elsewhere be the pdf of x , find the distribution function and the pdf of y=x^2 How many pounds of a 35% salt solution and how many pounds of a 14% salt solution should be combined so that 50 pounds of a 20% salt solution are obtained?