exam Maths Puzzle Numerical Ability

I am having trouble with this question it asks:
The sum of a number and its reciprocal is
10. What is the number? It also says I need to cheack.
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3
Please and Thank You=)

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exam Other Question
999+999= i dont understand how to do this. i was wondering if there is an easier way to try and figure out these problems, or a step-by-step guide on how to do each problem. Thank you!