book Maths Puzzle Numerical Ability

Help Please!
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

Add or subtract as indicated:

4/a-5 - 1/5-a

Thanks for any help given! identify the root to the nearest tenth.
y=4-x^2
i came out with x=-2.1 and x=1.9, but i am not sure if this is correct.