exam Maths Puzzle Numerical Ability

i need help with the following questions

1. In the equation of the ellipse 25x^2+9y^2-150x-90y+225=0, e=______?

2. The length of the latus rectum of 25x^2+9y^2-150x-90y+225

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One solution was 10% alcohol and the other was 30% alcohol. HOw much of each should be used to get 200 gallons of a solution that is 17% alcohol? The length of fence required to enclose a rectangular field is 3000 meters. What are the dimensions of the field if the difference between its length and width is 50 meters?