book Maths Puzzle Numerical Ability

I'm on a planet that is a smooth sphere 25,000 miles in circumference. There is a string, perfectly inelastic and nearly weightless, tied firmly around the planet on a great circle

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book Other Question

{{{(x-2)^2/9+(y-4)^2/25=1}}} This equation defines an ellipse with center (___, ___). The major axis has length ____ and the minor axis has length ____. In a right triangle, if one acute angle has measure 6x-10 and the other has measure 2x-4, find the larger of these two angles.

A) 13 degrees
B) 22 degrees
C) 47 degrees
D) 68 degrees