exam Maths Puzzle Numerical Ability

Find the missing number X in x/65=1/5

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exam Other Question

How many sqares that do not contain ther red cell can be formed on an 8 x 8 checkerboard? I don�t get how to do this at all, please help me.
Write these ellipses in standard form and find the center, foci, vertices, and co-vertices.

1. {{{ 25x^2+4y^2+50x-8y-71=0 }}