book Maths Puzzle Numerical Ability

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Problem:
Jon and Lauren have a combined income of 48,000. Lauren earns 3,000 more than half of what Jon earns. How much does each earn?

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book Other Question

i want to know all the formulas of cos {{{(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 ____.