exam Maths Puzzle Numerical Ability

x=1/y+2 for y

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exam Other Question

1,3,5,7,9,11,13,15,17,19 these are 10 numbers and there sum is 100 select 5 from these numbers and there sum is 50 Can you please help me find:
center, vertices, covertices and foci of the ellipse x^2/4+y^2/9=16
Thank you so much!!